Note bill (money)
notecase wallet - obsolete. In BrE, men carry a wallet, ladies carry a purse in their handbag
noughts and crosses tic-tac-toe
number plate license plate - both now used in BrE
oblique slash (punctuation) - obsolete
on-cost overhead expense - obsolete
open university extension courses, distance education
outfitter clothing store - virtually obsolete. Gentlemen's outfitter is rarely used to describe an old-fashioned kind of men's clothing shop.
pack of cards deck of cards
page (hotel) bell boy - obsolete. Bell boy used in BrE now
pants underwear
paper handkerchief tissue - obsolete. Tissue used in BrE. Although the brand Kleenex is sold in the UK, we don't refer to a tissue as a Kleenex as I have heard in the US.
Pass out graduate - obsolete. Pass out only used for military graduations in BrE
patience solitaire - both used in BrE
pavement sidewalk
peep-bo peek-a-boo
Peg clothespin
perspex Plexigla
petrol gas, gasoline
pickled cucumbers pickles - obsolete. In BrE, gherkin used for what Americans call pickle. British pickle is a tangy kind of relish/chutney often used to make cheese sandwiches.
pictures movies
piece-tin lunch box - obsolete
*** drunk
pleader lawyer, attorney - obsolete. The UK justice system divides lawyers who work in the courtroom (barristers) from those who work outside the courtroom (solicitors).
ponce pimp - old-fashioned (1950's) slang.
pop round come by
porridge oatmeal
Post mail
Post free postpaid - More commonly Freepost or Pre-paid in BrE now.
postcode zip code
postoffice directory telephone directory - obsolete. Usually phone book or occasionally phone directory.
power cut power failure
preggers pregnant - old-fashioned slang.
press man journalist, reporter - obsolete. Journalist or reported used in BrE now
private address home address - obsolete
professor conductor (orchestra) - obsolete. Conductor used in BrE, and has been for generations.
programme show
proofed waterproofed - obsolete.
Pub bar, saloon
Punt gamble (means kick or skip in American)
purse pocketbook
pylon utility pole
queue line
Quit behave - Quit is not usually used to mean behave in BrE. If anything, it's the other way round - more likely to be used in AmE, in my understanding.
radiogram stereo - Obsolete by about 50 years.
ramble walk, stroll
Rate tax
Read out read aloud - both used in BrE.
reader's ticket library card - obsolete
ready, steady, go! ready, set, go!
recap Retread
reckoning machine cash register - obsolete. More usually called the till in BrE
recorded delivery Return receipt requested, certified / registered mail
remould Retread
return ticket round-trip ticket
reverse charge collect call
ring pull a can's tab
ring up Call
roll neck turtle neck
round sandwich - obsolete
Roup auction - either regional slang or so obsolete that I've never, ever encountered this word before
rubber eraser (means condom in American)
rubbish bin trash can
Rug Blanket - not the same thing. A rug goes on the floor, a blanket goes on the bed.
running knot slip knot - virtually obsolete in BrE. Slip knot more often used (if at all).
rusticated suspended (punishment) - obsolete slang
salt beef corned beef - obsolete. Corned beef used in BrE, different from American salt beef which can sometimes be found in delis here in the UK
salt pot salt shaker
sandpit Sandbox
scent Perfume - old-fashioned. Perfume more often used in BrE these days
scrape butter or margarine, thinly spread
scurf Dandruff - obsolete. Dandruff used in BrE
self-drive car rental car - Obsolete. Hire car more often used in BrE, sometimes rental car
semi-detached house Duplex
service lift dumbwaiter - They mean different things in BrE these days.
serviette Napkin
Shop gazing window shopping, browsing - Shop gazing never used in BrE. Both window shopping (from the outside) and browsing (inside the shop) are current in BrE.
side (billiards) English - this term unknown to me, but billiards has largely been supplanted by snooker and pool in the UK
silencer (vehicles) Muffler
silent number unlisted number - obsolete. Ex-diretory now used in BrE
single ticket one-way ticket
singlet T-shirt - obsolete since the 1960's. T-shirt commonly used in BrE.
six-over-six 20-20 vision - obsolete.
Slide barrette (hair)
Slip men's underwear (means women's undergarments in American) - obsolete. It's a pretty old-fashioned word for a women's petticoat in BrE these days.
smart well-dressed (means clever in American)
snowslip Avalanche - obsolete. Avalanche used in BrE
spanner Wrench
spatula tongue depressor - In hospitals, tongue depressor more often used in BrE. A spatula usually means a kind of kitchen utensil these days.
spirits alcohol (liquor, brandy, whiskey)
spool cassette, tape, reel, roll - all of these terms are becoming obsolete in this new media age.
squails tiddlywinks - obsolete. Tiddly-winks is used in BrE, though the game has been out of fashion for decades.
squib firecracker
stance taxi stand - obsolete. Taxi rank used in BrE
Stop late stay late - 'stop' meaning 'stay' now rarely used in BrE. More common in north of UK.
Stop open stay open - virtually obsolete
strapping Bandages - obsolete
subject Citizen - they mean different things in BrE. We stopped being British Subjects in the 1980s and became British Citizens.
suction cleaner vacuum cleaner - obsolete. The brand name 'hoover' is used in the UK to describe the object and the activity
sugar soap paint remover
sun-filter cream sun-screen lotion - obsolete. Sun-tan lotion or sunscreen used in BrE
surgery doctor's office (means operating room in American)
surname last name, family name
suspenders Garters
sweater Sweatshirt - now mean different things in BrE. Sweater is used in AmE where jumper is used in BrE to mean a woollen top.
sweet oil olive oil - obsolete. Olive oil used in BrE
sweeties, sweets Candy
swiss bun Danish - obsolete. Danish or Danish pastry used in BrE
swiss roll jelly roll
Swot study hard, cram
Table a proposal discuss a proposal (opposite of American meaning) - Tabling a proposal no longer current in everyday English, except in Parliament where a motion is tabled (a prospective law is put on the agenda for discussion)
tablets pills, medicine
Take a decision make a decision - both used in BrE
Take with take out, to go (fast-food restaurant) - Incorrect. Only take-away is used in BrE
Take-away carry-out (fast-food restaurant)
Tap Faucet
taxi rank taxi stand
telephonist telephone operator - obsolete
Telly television, TV (pronounced tee-vee)
Tick check mark
tights Pantyhose
timeous, timous early, timely - obsolete
Tin Can
tinkle telephone call (means urinate in American) - very old-fashioned slang. You might still hear 'give us a bell' in BrE, meaning 'telephone me'.
to time on time - obsolete. Running on time used in BrE
toothful Sip - obsolete
torch Flashlight
Tot add, calculate a total
touch wood knock on wood
tower block Skyscraper - These have come to mean different things in BrE. A skyscraper is considerably taller than a tower block.
Town centre Downtown
tradesman Storekeeper
Tram trolley, streetcar - obsolete. In cities where this system still operates, it's called the tram.
treacle Molasses
treacle sponge Gingerbread - different things in BrE.
trolley shopping cart
trousers Pants
trunk call toll call, long distance call - obsolete. Long distance call used in BrE
Tube of candy roll of candy - Candy is not used in BrE. We generally have a packet of sweets, even where the sweets are in a roll shape (for example, a packet of Fruit Pastilles). The exception is Smarties, which are sold in a cardboard tube.
Tube station subway station
tunny tuna fish - obsolete. Tuna used in BrE
Turn off discharge, fire - obsolete
Turn out a room thoroughly clean a room - obsolete
underground Subway - they mean different things in BrE. The Underground (or Tube) is the underground railway system. A subway is a pedestrian tunnel built under a busy road.
unmade track dirt road - more often dirt track in BrE now
vacuum flask thermos bottle - more usually a Thermos or just a flask in BrE
Vest T-shirt, undershirt
victualler Innkeeper - obsolete. The person who runs a pub is a landlord.
waist coat Vest - Written as one word in BrE now: waistcoat
Wall safe food cupboard or cabinet in the kitchen - obsolete. Kitchen cabinet or cupboard used in BrE.
water ice Sherbet - obsolete. Closest we would have in the UK these days would be sorbet.
white coffee coffee with cream
whole time full time - largely obsolete. A person would describe their working pattern as full-time or part-time in BrE
Wind cheater Windbreaker - A wind cheater is an old-fashioned word for a light plastic jacket in the UK. A windbreaker is more often used for the fabric screen families put up on cold and windy British beaches to get shelter from the wind.
windscreen Windshield
wire wool steel wool - both are used in BrE
zed the letter zee (z)
Obviously I'm only looking at these from a British English perspective. There may well be cases where both are used in the UK, but an AmE user might not understand one of the terms immediately.