Alligator has nine letters, but the word only has four vowels.
Abstemious doesn't quite make it. It's 10 letters.
alien
avoid
ounce
reuse
facetious
Queue
Rake perhaps?
Deceive
Headache starts and ends with the letters he. Another word is heartache.
"TOURIST"
Dominique
Lighthearted is a 12 letter word. Lithographed is another 12 letter word that starts with L and ends with D.
angina aurora another one......amoeba
queue
gypsy pygmy
A word that starts with y and ends with y is yay .
Pift! Everyone knows that, it's Nager