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6 letter words:

krubis12,

5 letter words:

birks11, brisk11, brusk11, krubi11,

4 letter words:

birk10, bisk10, busk10, irks8, kirs8, kris8, risk8, rusk8, bris6, burs6, ribs6, rubs6, urbs6,

3 letter words:

irk7, kir7, kis7, ski7, suk7, bis5, bur5, bus5, rib5, rub5, sib5, sub5, urb5, sir3, sri3,

2 letter words:

ki6, bi4, is2, si2, us2,