5 letter words:
fires8,
fries8,
frise8,
reifs8,
serif8,
peris7,
piers7,
pries7,
prise7,
ripes7,
speir7,
spier7,
spire7,
4 letter words:
fire7,
firs7,
refs7,
reif7,
rife7,
rifs7,
seif7,
serf7,
peri6,
pier6,
pies6,
reps6,
ripe6,
rips6,
sipe6,
ires4,
reis4,
rise4,
sire4,
3 letter words:
efs6,
fer6,
fes6,
fie6,
fir6,
ifs6,
ref6,
rif6,
per5,
pes5,
pie5,
pis5,
psi5,
rep5,
rip5,
sip5,
ers3,
ire3,
rei3,
res3,
sei3,
ser3,
sir3,
sri3,
2 letter words:
ef5,
fe5,
if5,
pe4,
pi4,
er2,
es2,
is2,
re2,
si2,