Naval, adj. of or relating to ships, especially warships
Navel, n. the central point of anything, also the belly-button
Fortunately the ship’s crew didn’t have to manage any naval disasters, while the naval officer ate a navel orange and contemplated his navel.
None, pron. not one, not any
Nun, noun. a female member of a religious order
None of the nuns knew what to do with Maria.
Night, n. the period of darkness between sunset and sunrise
Knight, n. a mounted soldier in the Middle Ages, also a member of any order which designates its members as such