Earthman, earthmen, eighteen, ejection, election, electron, emission, envision, equation, erection, eruption, eversion, everyman, everymen and eviction are eight letter words. They begin with the letter e and end with n.
traction
androgen, andorren,
Sandman (starts with S ends with N - 7 letter word)
A four letter word that starts with g and ends with n is gown :)
nutrition
Kitten or mitten.
onion
Domain is one of the words that starts with the letter D and ends with the letter N.
maturation
END
negotiatornormalizer
andiron