5 letter words:
boyfs13,
4 letter words:
boyf12,
foys10,
boys9,
fibs9,
fobs9,
sybo9,
yobs9,
bios6,
bois6,
obis6,
3 letter words:
foy9,
boy8,
bys8,
fib8,
fob8,
yob8,
ifs6,
oys6,
sif6,
soy6,
yos6,
bio5,
bis5,
boi5,
bos5,
obi5,
obs5,
sib5,
sob5,
ios3,
iso3,
2 letter words:
fy8,
by7,
if5,
of5,
oy5,
yo5,
bi4,
bo4,
ob4,
io2,
is2,
oi2,
os2,
si2,
so2,