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5 letter words:

brook11,

4 letter words:

book10, bork10, kobo10, kolo8, look8, rook8, bolo6, boor6, broo6, lobo6, obol6,

3 letter words:

kob9, kor7, boo5, bro5, lob5, orb5, rob5, loo3,

2 letter words:

bo4, lo2, or2,