Self describing words that start with Y?

yappy

yare (quick), yarer, yarest

yechy, yucky, yuckier, yuckiest

yellow, yellower, yellowest, yellowish, yellowy

yeuky (itchy)

Yiddish

yokeless

yokelish (like a yokel)

young, younger, youngest, youngish, youthful

yummy, yummier, yummiest