9 letter words:
combustor15,
8 letter words:
motorbus12,
7 letter words:
combust13,
cormous11,
scrotum11,
6 letter words:
combos12,
coombs12,
crumbs12,
bromos10,
brooms10,
comous10,
custom10,
mucors10,
courts8,
motors8,
robots8,
robust8,
tumors8,
turbos8,
torous6,
5 letter words:
combo11,
combs11,
coomb11,
crumb11,
booms9,
bosom9,
bromo9,
broom9,
corms9,
curbs9,
mucor9,
mucro9,
scrub9,
scrum9,
tombs9,
umbos9,
boors7,
boost7,
boots7,
borts7,
bouts7,
broos7,
bruts7,
burst7,
coots7,
court7,
crust7,
curst7,
moors7,
moots7,
morts7,
motor7,
robot7,
rooms7,
scoot7,
scour7,
scout7,
storm7,
strum7,
torcs7,
tumor7,
turbo7,
roost5,
roots5,
rotos5,
roust5,
routs5,
stour5,
toros5,
torso5,
torus5,
tours5,
4 letter words:
comb10,
boom8,
bums8,
cobs8,
corm8,
cubs8,
curb8,
mobs8,
mocs8,
scum8,
tomb8,
umbo8,
boor6,
boos6,
boot6,
bort6,
bots6,
bout6,
broo6,
bros6,
brut6,
burs6,
bust6,
buts6,
coos6,
coot6,
cors6,
cost6,
cots6,
crus6,
curs6,
curt6,
cuts6,
moor6,
moos6,
moot6,
mors6,
mort6,
most6,
mots6,
must6,
muts6,
orbs6,
orcs6,
robs6,
rocs6,
roms6,
room6,
rubs6,
rums6,
scot6,
scut6,
smut6,
sorb6,
stob6,
stub6,
stum6,
sumo6,
toms6,
toom6,
torc6,
tubs6,
urbs6,
oots4,
orts4,
ours4,
oust4,
outs4,
root4,
roto4,
rots4,
rout4,
rust4,
ruts4,
soot4,
sort4,
sour4,
toro4,
tors4,
tour4,
3 letter words:
bum7,
cob7,
cub7,
cum7,
mob7,
moc7,
boo5,
bos5,
bot5,
bro5,
bur5,
bus5,
but5,
coo5,
cor5,
cos5,
cot5,
cru5,
cur5,
cut5,
moo5,
mor5,
mos5,
mot5,
mus5,
mut5,
oms5,
orb5,
orc5,
rob5,
roc5,
rom5,
rub5,
rum5,
sob5,
som5,
sub5,
sum5,
tom5,
tub5,
urb5,
oot3,
ors3,
ort3,
our3,
out3,
rot3,
rut3,
sot3,
sou3,
too3,
tor3,
uts3,
2 letter words:
bo4,
mo4,
mu4,
om4,
um4,
or2,
os2,
so2,
to2,
us2,
ut2,
