The word with no vowels

There is, to my knowledge, one, and only one, word in Modern English that contains no vowels.

For the sake of clarity, vowels are the letters 'a', 'e', 'i', 'o', 'u', and, when representing vowel sounds, 'y', and 'w'.

As a brief aside, if you don't believe that 'w' can serve as a vowel, compare the pronunciations of "plow" and "snow"; 'w' serves as a vowel in the latter case. Noting that 'w' can be a vowel eliminates "cwm" and "crwth".

There is, however, one word that does not use any vowels or other letters to represent vowel sounds; its vowel is implied. The word is "nth".

Comments

You'll have to specify what dictionary you're using, or what restrictions on words you want. Brr, grr, hmm, and shh appear in many dictionaries.

For the sake of this discussion, I was not considering onomatopoeic sound descriptions to be English words; I should have been more explicit.