According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 277 words with the pattern --RR----. That is, eight letter words with 3rd letter R and 4th letter R. In alphabetical order, they are:
barrable
barracan
barraces
barracks
barraged
barrages
barranca
barranco
barrater
barrator
barratry
barreing
barreled
barrener
barrenly
barretor
barretry
barrette
barricos
barriers
barriest
barrings
barrooms
barrulet
berretta
berrigan
berrying
birretta
birrotch
borrelia
borrowed
borrower
burramys
burrells
burrhels
burriest
burritos
burrowed
burrower
carracks
carracts
carraway
carrects
carrells
carriage
carriers
carriole
carrions
carritch
carromed
carrotin
carryall
carrycot
carrying
carryons
carryout
cerrises
cirriped
corraded
corrades
corrects
corridas
corridor
corrival
corroded
corroder
corrodes
corrupts
currachs
curraghs
currants
curranty
currency
currents
curricle
curriers
curriery
currying
darraign
darraine
darrains
darrayns
derricks
derriere
derrises
earrings
farragos
farriers
farriery
farrowed
farrucas
ferrates
ferreled
ferreous
ferreted
ferreter
ferriage
ferrites
ferritic
ferritin
ferrugos
ferruled
ferrules
ferrying
ferryman
ferrymen
firriest
firrings
forrader
forrayed
furriers
furriery
furriest
furriner
furrings
furrowed
furrower
garreted
garrigue
garrison
garroted
garroter
garrotes
garrotte
gurriers
harridan
harriers
harrowed
harrower
harrumph
harrying
herrings
herrying
hirrient
horrible
horribly
horrider
horridly
horrific
hurrahed
hurraing
hurrayed
hurriers
hurrying
jarrings
jerreeds
jerrican
jerrycan
larrigan
larrikin
larruped
larruper
lorrells
marranos
marriage
marrieds
marriers
marrowed
marrying
merriest
merryman
merrymen
mirrored
morrells
morrhuas
morrices
morrions
morrised
morrises
murraghs
murrains
murrelet
murrhine
murrions
myrrhine
myrrhols
narrases
narrated
narrater
narrates
narrator
narrowed
narrower
narrowly
parridge
parriers
parritch
parrocks
parroket
parroted
parroter
parrotry
parrying
perradii
perriers
perruque
porrects
porridge
porridgy
porrigos
purrings
pyrrhics
pyrrhous
pyrroles
pyrrolic
sarrasin
sarrazin
serranid
serranos
serrated
serrates
serratus
serrying
sorriest
sorrowed
sorrower
sorryish
surrebut
surround
surroyal
tarragon
tarrases
tarriers
tarriest
tarrings
tarrocks
tarrowed
tarrying
terraced
terraces
terrains
terranes
terrapin
terrases
terrazzo
terreens
terrella
terrenes
terrible
terribly
terriers
terrific
terrines
terroirs
tirrivee
tirrivie
torrents
torrider
torridly
turreted
turrical
verrucae
verrucas
verrugas
warragal
warragle
warragul
warrands
warraned
warrants
warranty
warrayed
warrener
warreyed
warrigal
warriors
warrison
werrises
wirricow
worricow
worriers
worrited
worrycow
worrying
yarraman
yarramen
Carried married tarried carries marries tarries terrier farrier
buzzingfizzing
carhops, barhops, earhole
letters
Blogger is a seven letter word that the 3rd letter is an O and the 4th letter is a G.
7 letter words with I as the 4th letter:articleartisanbroiledcomicalchoicesclaimeddelightdesiredempiresinvitedinvitesmonitornovicespelicanrelivedretiredshrinkssimilarsplintsstrikesstripesstrivesthrillsthrivestrailedunhinge
That's natural.
greater
mascots
That's trouble.
elixirs
This should say "two-word" (not proper hyphenated) : "CUECARD" (cue card).
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