5 letter words:
cisco9,
cocos9,
4 letter words:
zoic15,
zoos13,
wows10,
cows9,
scow9,
coco8,
woos7,
coos6,
3 letter words:
wiz15,
coz14,
zoo12,
wow9,
cow8,
sow6,
wis6,
woo6,
wos6,
cis5,
coo5,
cos5,
sic5,
2 letter words:
ow5,
wo5,
is2,
oi2,
os2,
si2,
so2,