7 letter words:
fibrous12,
5 letter words:
forbs10,
fours8,
biros7,
brios7,
4 letter words:
fibs9,
fobs9,
forb9,
fubs9,
firs7,
four7,
furs7,
rifs7,
surf7,
bios6,
biro6,
brio6,
bris6,
bros6,
burs6,
obis6,
orbs6,
ribs6,
robs6,
rubs6,
sorb6,
urbs6,
ours4,
sori4,
sour4,
3 letter words:
fib8,
fob8,
fub8,
fir6,
for6,
fou6,
fro6,
fur6,
ifs6,
rif6,
bio5,
bis5,
bos5,
bro5,
bur5,
bus5,
obi5,
orb5,
rib5,
rob5,
rub5,
sib5,
sob5,
sub5,
urb5,
ors3,
our3,
sir3,
sou3,
sri3,
2 letter words:
if5,
of5,
bi4,
bo4,
is2,
oi2,
or2,
os2,
si2,
so2,
us2,
