nocturnal, nonanimal, noncasual, noncausal, noncoital, nonformal, nonfossil, nonmanual, nonmental, nonpareil, nonracial, nonschool, nonsexual, nonsocial, nonverbal, nonvisual, nosewheel, numerical
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern -N-EL. That is, five letter words with 2nd letter N and 4th letter E and 5th letter L. In alphabetical order, they are:
angel
intel
kneel
newel, natal, naval, novel, navel
Nickel
Queue
Rake perhaps?
angry
Alligator has nine letters, but the word only has four vowels.
Sandman (starts with S ends with N - 7 letter word)
Cash is a 4 letter word that starts with c and ends with h.
An eight letter word that starts with S and ends with T: satiristshortestsmallestsmarteststagnantstalwartstiffeststridentsubtract
A seven letter word that starts with D and ends with T: decrypt
pacific
queue
gypsy pygmy
A four letter word that starts with J and ends with M: jism.