6 letter words:
otitic8,
otitis6,
5 letter words:
stoic7,
titis5,
toits5,
4 letter words:
cist6,
cost6,
cots6,
otic6,
scot6,
tics6,
stot4,
titi4,
tits4,
toit4,
tost4,
tots4,
3 letter words:
cis5,
cos5,
cot5,
sic5,
tic5,
its3,
sit3,
sot3,
tis3,
tit3,
tot3,
2 letter words:
is2,
it2,
oi2,
os2,
si2,
so2,
ti2,
to2,