Navis, a ship; navigate, naval, navy.
Necto (nex-us), I tie; connect, nexus, annex.
Nego, I deny; negative, negation.
Noceo, I hurt; noxious, innocuous, innocent.
Nomen (nomĭn-is), a name; nominal, nomination, cognomen.
Nosco (not-um), I know or mark; note, notation.
Novus, new; novel, novitiate, innovation.
Nox (noct-is), night; nocturnal, equinoctial.
Nudus, naked; nude, denudation.
Numero, I number; enumerate, numeration.