If you're just looking for a list of all words that contain two consecutive I's ("II"), they're listed below. All of the words are legal Scrabble words under SOWPODS (meaning at tournaments outside of North America and Thailand).
If you're goal is to improve your Scrabble word knowledge, we urge you to instead look at the lists of "most commonly played words" provided elsewhere on this website. The reason is that you will never even have the opportunity to play the vast majority of the words listed below, so there's no point in memorizing them.
aalii
aaliis
accessorii
alibiing
anobiid
anobiids
antibacchii
aquariist
aquariists
arctiid
arctiids
assagaiing
assegaaiing
assegaiing
bacchii
braaiing
breiing
charivariing
chivariing
congii
coniine
coniines
coraciiform
denarii
dochmii
dupondii
euphausiid
euphausiids
fasciitis
fasciitises
filariid
filariids
gastrocnemii
genii
gobiid
gobiids
graffitiing
hikoiing
hongiing
interradii
leylandii
leylandiis
marconiing
medii
mihiing
modii
monoskiing
monoskiings
nauplii
naupliiform
obiing
obiism
obiisms
obiit
octonarii
paraskiing
paraskiings
perradii
piing
radii
reduviid
reduviids
retiarii
sacroiliitis
sacroiliitises
safariing
sartorii
saturniid
saturniids
senarii
septenarii
sestertii
sextarii
shanghaiing
shiitake
shiitakes
skiing
skiings
splenii
stapedii
sylviine
taxiing
teiid
teiids
tholeiite
tholeiites
tholeiitic
tikiing
torii
trapezii
triiodomethane
triiodomethanes
turfskiing
turfskiings
waterskiing
waterskiings
wongiing
zombiism
zombiisms