A word that starts with y and ends with y is yay .
If u mean starts with a vowel and ends in a vowel, then Avalanche?
ungrateful
unfit
ultrasound
uncomprehensive
until, usual
Nauru starts with N and ends with U. Nauru is an island country in Micronesia.
tofu
If u mean starts with a vowel and ends in a vowel, then Avalanche?
There are a few words that end with the letter v. However, no words in the English language begin with u and end with v.
Menu
ungrateful
unify
unfit
ultrasound
uncomprehensive
caribou