4 letter words:
cobs8,
bios6,
bois6,
boss6,
coss6,
obis6,
sibs6,
sics6,
sobs6,
socs6,
isos4,
3 letter words:
cob7,
bio5,
bis5,
boi5,
bos5,
cis5,
cos5,
obi5,
obs5,
sib5,
sic5,
sob5,
soc5,
ios3,
iso3,
sis3,
sos3,
2 letter words:
bi4,
bo4,
ob4,
io2,
is2,
oi2,
os2,
si2,
so2,