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107 five letter words begin with NA, and the third box is spread thinly with no letter above about one in nine.
N leads at about eleven percent and R at ten. I, M and V take eight each, then S at seven.
NAMES, NAKED, NAMED, NAVAL and NASTY are the most common entries, and they reach five different third letters.
NANNY and NANCE put a second N straight after the opening pair. It is a small shape, but a repeated N confirms it outright.
NAILS is the most informative opener. Its I, L and S reach three different branches and none of its letters repeats.
They differ in the last box, so landing either one settles the other. NAMES is the more common of the two.
It is an ordinary English word borrowed from French. Its three vowels also make it useful for clearing the later boxes.
NA opens a wide range of unrelated roots and is not a prefix, so nothing accumulates behind any one third letter.