5 letter words:
bison7,
opsin7,
pions7,
4 letter words:
bops8,
bins6,
bios6,
ibis6,
nibs6,
nips6,
nobs6,
obis6,
pins6,
pion6,
piso6,
pois6,
pons6,
snib6,
snip6,
snob6,
spin6,
ions4,
nisi4,
3 letter words:
bop7,
bin5,
bio5,
bis5,
bos5,
nib5,
nip5,
nob5,
obi5,
ops5,
pin5,
pis5,
poi5,
psi5,
sib5,
sip5,
sob5,
sop5,
ins3,
ion3,
nos3,
ons3,
sin3,
son3,
2 letter words:
bi4,
bo4,
op4,
pi4,
in2,
is2,
no2,
oi2,
on2,
os2,
si2,
so2,