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Forty six words put D first and N third, and every branch is a single three letter stem taking different endings.
I takes the second box in thirteen of the forty six and every one of those words opens DIN. O takes ten and all of those open DON. U takes nine for DUN, E takes seven for DEN and A takes five for DAN.
So the second box tells you the stem and nothing more. Every branch then takes a similar spread of endings, which is why this page narrows so slowly after the first guess.
DINGS, DONGS and DUNGS differ in one box. DINKY and DUNNY, DANDY and DINGY, DENTS and DINTS and DUNTS all do the same thing.
G leads the fourth box on nine words and E follows on eight. Neither is decisive, which leaves the final box carrying most of the load.
S closes sixteen of the forty six, thirty five percent, and Y another nine. Between them they take twenty five of the page, so ruling out both at once is easily the biggest cut available.
DANCE or DENSE. Both are common, both avoid the plural ending that dominates the page, and they test different vowels.
Yes, it runs D, O, N, U, T. It is one of the few entries here that is neither a plural nor an adjective in Y.
Nine words take it, mostly adjectives built off the short stems, like DANDY, DINGY, DUNGY and DONSY. The stems accept the ending almost interchangeably.