Hi Tom
My pronunciation of "maximum" is apparently a little more "staccato" than yours, and there is definitely no Z sound. I might represent my pronunciation this way:
macks-ih-mum
The pronunciation in the M-W dictionary sounds like mine.
When I pronounce the word "absorb", the S sounds more like a Z than an S.
Mr. Tom“But, of course, eraser can be pronounced with either a z-sound or s-sound...right?”
I would say definitely
not in American English. I would find it odd to hear that word pronounced in an American accent with a Z sound. I would only pronounce it with an S sound.