5 letter words:
birsy10,
bitsy10,
brits7,
4 letter words:
bist6,
bits6,
bris6,
brit6,
ribs6,
rits4,
stir4,
3 letter words:
bys8,
sty6,
try6,
bis5,
bit5,
rib5,
sib5,
its3,
rit3,
sir3,
sit3,
sri3,
tis3,
2 letter words:
by7,
bi4,
is2,
it2,
si2,
st2,
ti2,