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Twenty three words carry A second and F third, and close to half of them double that F.
Ten of the twenty three repeat a letter, and the repeat is nearly always a second F in the fourth box. BAFFS, DAFFY, GAFFE, RAFFS and TAFFY all work this way.
That makes the fourth box unusually easy to guess. F takes it in ten words, forty three percent, with I next on six.
SAFER, CAFES, WAFER, MAFIA and RAFTS are the entries with everyday currency. Everything else leans towards dialect or borrowed vocabulary.
Twelve letters start these twenty three, and the busiest manages only three. Confirming A and F leaves the first box almost untouched.
S ends twelve of the twenty three, so a plural is the single likeliest way one of these finishes.
SAFER and WAFER are the two most ordinary words here, and they differ in the first box and the fourth. Trying one tells you a lot about the other.
Six of them do. They are plurals of short nouns like GAFF and WAFF, which is also why the doubled F is so common.
Yes, a cheap rum made from sugarcane. It sits in the same I branch as MAFIA and KAFIR.