11 letter words:
improvisors18,
10 letter words:
improvisor17,
9 letter words:
provisors14,
promisors13,
promissor13,
8 letter words:
provisor13,
provisos13,
promisor12,
7 letter words:
improvs14,
proviso12,
porisms11,
virosis10,
pissoir9,
porosis9,
6 letter words:
improv13,
vrooms11,
porism10,
primos10,
prisms10,
promos10,
spooms10,
visors9,
miosis8,
morris8,
morros8,
pooris8,
priors8,
prosos8,
smirrs8,
smoors8,
sopors8,
spoors8,
5 letter words:
mirvs10,
omovs10,
spivs10,
vroom10,
impis9,
moops9,
pomos9,
primi9,
primo9,
prims9,
prism9,
promo9,
proms9,
romps9,
simps9,
spims9,
spoom9,
rivos8,
visor8,
misos7,
moors7,
morro7,
mosso7,
pisos7,
poori7,
prior7,
priss7,
proso7,
pross7,
risps7,
rooms7,
roops7,
simis7,
smirr7,
smirs7,
smoor7,
sooms7,
soops7,
sopor7,
spoor7,
orris5,
siris5,
4 letter words:
mirv9,
omov9,
spiv9,
vims9,
impi8,
imps8,
mips8,
moop8,
mops8,
pomo8,
poms8,
prim8,
prom8,
romp8,
simp8,
spim8,
rivo7,
sovs7,
vors7,
isms6,
miri6,
miro6,
mirs6,
miso6,
miss6,
mooi6,
moor6,
moos6,
mors6,
moss6,
ooms6,
oops6,
pirs6,
piso6,
piss6,
pois6,
poor6,
poos6,
poss6,
proo6,
pros6,
psis6,
rims6,
rips6,
risp6,
roms6,
room6,
roop6,
simi6,
sims6,
sips6,
smir6,
soms6,
soom6,
soop6,
sops6,
iris4,
isos4,
roos4,
siri4,
sirs4,
sori4,
sris4,
3 letter words:
vim8,
imp7,
mop7,
pom7,
sov6,
vis6,
vor6,
ism5,
mir5,
mis5,
moi5,
moo5,
mor5,
mos5,
oms5,
oom5,
oop5,
ops5,
pir5,
pis5,
poi5,
poo5,
pos5,
pro5,
psi5,
rim5,
rip5,
rom5,
sim5,
sip5,
som5,
sop5,
ios3,
iso3,
oor3,
oos3,
ors3,
roo3,
sir3,
sis3,
sos3,
sri3,
2 letter words:
mi4,
mo4,
om4,
op4,
pi4,
po4,
io2,
is2,
oi2,
oo2,
or2,
os2,
si2,
so2,
