Yes, the word is there. I never was taught Y is a vowel. I know there are twelve different vowel sounds + eight different sound combinations with two vowels, yes? I haven't read the previous posts about Y as consonant,
I was going to guess crypts or lymphs. Both have six letters and no vowels. I was always taught that the letter 'y' was a secondary vowel, as it sometimes makes the sound of a vowel, but isn't genuinely regarded as one.