moron, minion, mammon, man, mean, mission
norm
moron, melon.
a word that starts with k and ends in n is known
maturation
Monsoon.
Sandman (starts with S ends with N - 7 letter word)
morgan
nonintervention
A four letter word that starts with g and ends with n is gown :)
nurtured
Bassoon
It could be multiplication.