7 letter words:
ossific12,
5 letter words:
coifs10,
ficos10,
fiscs10,
4 letter words:
coif9,
fico9,
fisc9,
foci9,
foss7,
coss6,
sics6,
socs6,
isos4,
3 letter words:
ifs6,
sif6,
cis5,
cos5,
sic5,
soc5,
ios3,
iso3,
sis3,
sos3,
2 letter words:
if5,
of5,
io2,
is2,
oi2,
os2,
si2,
so2,