Hipster
Breeder is a 7 letter words using only those letters
fetuses
Saguaro
Respite.
There are three 7-letter words possible:roosterrooterstoreros
Core.
There is no 8-letter word that can be made, there are these 7 and 6-letter words though:senegasagenesagonesgenoasgnosesgossanseasonsegnossenega
"EAU" is the only all-vowel three letter word.
Respite
Beanbag
alpaca
RANGE