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7 letter words:

nonbook13,

4 letter words:

boko10, bonk10, book10, knob10, kobo10, nook8, boon6, noon4,

3 letter words:

bok9, kob9, kon7, bon5, boo5, nob5, obo5, non3, noo3, ono3, oon3,

2 letter words:

ko6, bo4, ob4, no2, on2, oo2,