NAIL, "to the—" (ad unguem), to perfection, to the very utmost.
NATIVE, natural.
NEAT, cattle.
NEAT, smartly apparelled; unmixed; dainty.
NEATLY, neatly finished.
NEATNESS, elegance.
NEIS, nose, scent.
NEUF (NEAF, NEIF), fist.
NEUFT, newt.
NIAISE, foolish, inexperienced person.