4 letter words:
yows10,
ywis10,
bows9,
boys9,
swob9,
sybo9,
yobs9,
iwis7,
bios6,
ibis6,
obis6,
3 letter words:
yow9,
bow8,
boy8,
bys8,
yob8,
sow6,
soy6,
wis6,
wos6,
bio5,
bis5,
bos5,
obi5,
sib5,
sob5,
2 letter words:
by7,
ow5,
oy5,
wo5,
yo5,
bi4,
bo4,
is2,
oi2,
os2,
si2,
so2,