Three-Letter Words: NAP, NIP.
Sandman (starts with S ends with N - 7 letter word)
A four letter word that starts with g and ends with n is gown :)
Domain is one of the words that starts with the letter D and ends with the letter N.
andiron
nabutas
maturation
negotiatornormalizer
reunion
Numbered
NEES
Tampon
cartoon