7 letter words:
ossific12,
6 letter words:
ficoes11,
cosies8,
5 letter words:
coifs10,
fices10,
fiscs10,
fosse8,
seifs8,
coses7,
cosie7,
sices7,
issei5,
4 letter words:
coif9,
fice9,
fico9,
fisc9,
foci9,
fess7,
foes7,
foss7,
seif7,
cess6,
coss6,
ices6,
secs6,
sice6,
sics6,
oses4,
seis4,
3 letter words:
efs6,
fes6,
fie6,
foe6,
ifs6,
cis5,
cos5,
ice5,
sec5,
sic5,
ess3,
oes3,
ose3,
sei3,
sis3,
sos3,
2 letter words:
ef5,
fe5,
if5,
of5,
es2,
is2,
oe2,
oi2,
os2,
si2,
so2,