9 letter words:
probiotic15,
7 letter words:
bioptic13,
portico11,
robotic11,
6 letter words:
biopic12,
biotic10,
octopi10,
probit10,
tropic10,
octroi8,
5 letter words:
boric9,
coopt9,
optic9,
picot9,
topic9,
orbit7,
oribi7,
poori7,
robot7,
topoi7,
toric7,
troop7,
torii5,
4 letter words:
coop8,
crib8,
crop8,
poco8,
biro6,
boor6,
boot6,
bort6,
brio6,
brit6,
broo6,
coir6,
coot6,
crit6,
obit6,
otic6,
poor6,
port6,
tipi6,
topi6,
topo6,
torc6,
trip6,
trop6,
riot4,
root4,
roti4,
roto4,
tiro4,
tori4,
toro4,
trio4,
3 letter words:
bop7,
cob7,
cop7,
pic7,
bio5,
bit5,
boo5,
bot5,
bro5,
coo5,
cor5,
cot5,
obi5,
opt5,
orb5,
orc5,
pit5,
poi5,
poo5,
pot5,
pro5,
rib5,
rip5,
rob5,
roc5,
tic5,
tip5,
top5,
oot3,
ort3,
rot3,
too3,
tor3,
2 letter words:
bi4,
bo4,
op4,
pi4,
it2,
oi2,
or2,
ti2,
to2,