Some U words (uniform, unique, unicorn) sound like YOO (the Y consonant followed by OO).
The word "one" sounds like it starts with a W (wun).
If u mean starts with a vowel and ends in a vowel, then Avalanche?
immediate
asparagus
apple
You should ask ‘what bird name starts and ends in a vowel?’
strengths
any
Arc
air
zoa
aioli
pea?