7 letter words:
biotope11,
6 letter words:
probit10,
bootie8,
protei8,
reboot8,
5 letter words:
probe9,
rebop9,
biter7,
boite7,
orbit7,
poori7,
repot7,
robot7,
toper7,
topoi7,
tribe7,
tripe7,
troop7,
trope7,
oorie5,
4 letter words:
bier6,
biro6,
bite6,
boor6,
boot6,
bore6,
bort6,
brie6,
brio6,
brit6,
broo6,
obit6,
oboe6,
peri6,
pert6,
pier6,
poet6,
poor6,
pore6,
port6,
repo6,
ripe6,
robe6,
rope6,
tope6,
topi6,
topo6,
trip6,
trop6,
riot4,
rite4,
root4,
rote4,
roti4,
roto4,
tier4,
tire4,
tiro4,
tore4,
tori4,
toro4,
trio4,
3 letter words:
bop7,
bet5,
bio5,
bit5,
boo5,
bot5,
bro5,
obe5,
obi5,
ope5,
opt5,
orb5,
per5,
pet5,
pie5,
pit5,
poi5,
poo5,
pot5,
pro5,
reb5,
rep5,
rib5,
rip5,
rob5,
tip5,
top5,
ire3,
oot3,
ore3,
ort3,
rei3,
ret3,
roe3,
rot3,
tie3,
toe3,
too3,
tor3,
2 letter words:
be4,
bi4,
bo4,
op4,
pe4,
pi4,
er2,
et2,
it2,
oe2,
oi2,
or2,
re2,
ti2,
to2,