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7 letter words:

intwist10, nitwits10,

6 letter words:

nitwit9,

5 letter words:

twins8, twist8, twits8, intis5, stint5, tints5, titis5,

4 letter words:

iwis7, twin7, twit7, wins7, wist7, wits7, inti4, nisi4, nits4, snit4, tins4, tint4, titi4, tits4,

3 letter words:

win6, wis6, wit6, ins3, its3, nit3, sin3, sit3, tin3, tis3, tit3,

2 letter words:

in2, is2, it2, si2, ti2,