in(: Indian starts with I ends with N
a word that starts with k and ends in n is known
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.
Noon Nun Naan Neon Noun
A word that starts with N and ends with S is nautilus or nutritious.
d o m i n i e n
A word that starts with AN and ends with OR: ancestor.
The longest word I could locate is nondiscrimination. The word contains 17 letters.
rein as in reindeer rein as in reindeer
yachtsman yachtsmen yellowfin
vacation valerian volition
Vain Vein Venn