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101 five letter words start with AN, and five different third letters sit within three points of each other.
T leads at about fourteen percent, N at thirteen, G at twelve, I at twelve and O at eleven. K takes another six.
ANGEL, ANGLE, ANGRY, ANGER and ANGST all run ANG, so confirming that G drops you into a family where only the last two boxes remain.
ANIME, ANNEX, ANKLE, ANNUM and ANNOY cover the other branches, and the doubled N in three of them is a shape worth testing separately.
ANGLE is the best opener. It covers the tightest family here and its L and E are two of the commonest closing letters in the group.
ANKLE is the natural follow up if the G misses, since its K reaches a branch nothing else common touches.
They use the same five letters with the E and L swapped, so a guess on one tells you almost nothing about the other. That pair is the trap here.
ANNEX, ANNUM and ANNOY. Three words, all in reasonable use, and a repeated N confirms the shape outright.
A substantial share, since AN opens a great many first names. The usable list runs well short of 101.