Gypsy
Lymph
Lynch
Pygmy
Shyly
Sylph
Tryst
Actually, these words do have vowels because its a, e, i, o, u.
And by the way "sometimes y" does not count.
Blocked, stopped, stopper, lockers, museums, commute, plainer, flatten, swishes, Did you mean constanants? That's harder... plainer, winnings (has six) museums, commute... what words do have five vowels in it?
A six letter word that has no vowels is "rhythm." Rhythm is a musical term that has multiple meanings in different contexts.
rhythms glycyls
rhythms
couch
Rhythms
rhythms
Rocking is a word with 7 letters 5 consonants and 2 vowels
all words have vowels in them
scarf
agree
aqueous
facetiously
queue
immediate
Sequoia.
queueing
peace, every
sequoia