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Two hundred thirty seven words begin with N, and the second box is a vowel in nearly all of them.
O takes the second box in sixty of the two hundred thirty seven, A in fifty seven, E in fifty one and I in forty three. U adds nineteen more.
Only seven letters appear there in total, and the handful that are not vowels hold seven words between them. The branches are close enough that the second box rarely settles anything on its own.
NIGHT, NORTH, NURSE, NAKED and NOISE are the entries most likely to be wanted, with NEVER, NOBLE and NASTY close behind.
Past those the page turns quickly into NABLA, NACHE, NAEVI, NAGOR and NAPOO. The useful vocabulary here is a small fraction of the two hundred thirty seven, which is why the N list plays smaller than its count.
S closes seventy of the two hundred thirty seven, thirty percent, with Y on thirty four. E fills the fourth box in forty nine words, twenty one percent.
Forty words repeat a letter, seventeen percent, mostly the doubled N of NANNY and NINNY. That is a modest share, so a repeat narrows usefully.
Both are common and they test different vowels. NIGHT also covers the GH shape, which nothing else here uses.
Much of the two hundred thirty seven is technical or borrowed. The words you would produce unprompted number a couple of dozen at most.
Seventy, which is thirty percent. Ruling out a plural is the biggest single cut this page offers.