For crying out loud y
is a vowel, (in American English),
if it's used as a vowel! Any college English and composition professor will tell you the same. CRWTH seems to be the only word given, besides NTH, and CWM that truly contain no vowels, unless you adopt the Welsh(?) rule that makes W a vowel Then that would make NTH the only word I've found.
Arguably BRR!, HMM?, GRR!,TSKTSK might be considered. Are they real words? Depends on the dictionary. Will we ever know? Of course not, there are just too many conflicting rules! Damn this ridiculous language!
I should really be doing my homework..
p.s. Thanks a lot Mr. Shay.