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Forty words put B first and T third, and fourteen of them repeat a letter. That is a third of the page and almost all of it is a doubled T.
A takes the second box in eleven words, U in eight, E and I in seven each and O in six. Only vowels appear there apart from a single Y, and no branch is large enough to chase.
T fills the fourth box in fourteen of the forty, thirty five percent, and E takes nine. Between them that is twenty three of the page. The fourth box is where this pattern actually divides.
BATTY, BATTS, BITTY, BITTS, BOTTS, BUTTE, BUTTY and BUTTS all double the T, and BETTA and BETTY join them. It is the single largest shape on the page and it explains the repeat count entirely.
They share four letters and split at the end, and BETHS and BOTHY sit nearby on the same H shape. S closes twelve of the forty and Y another six, so the final box carries most of the remaining work.
They differ in a single box and both are ordinary words. Take one and spend the other turn on a different vowel entirely, like BITES or BUTTE.
A currency unit. It is one of the narrower entries in the U branch and not one you would reach for.
Less than usual. Fourteen words carry one, so a repeat leaves you a large shortlist rather than an answer.