Merriam-Webster's Collegiate Dictionary:
rough-dry
rough-edged
rough-hew
rough-hewn
rough-legged hawk
roughage
roughcast
roughen
rougher
roughhouse
roughish
roughleg
roughly
roughneck
roughness
roughrider
roughshod
rouille
roulade
rouleau
roulette
roumanian
round
round angle
round clam
round dance
round lake beach
round lot
round on
round rock
round steak
round table
round the clock
round up
round window
round-robin
round-shouldered
round-the-clock
round-trip
roundabout
roundaboutness
roundball
rounded
roundedness
roundel
roundelay
rounder
roundhead
roundheaded
roundhouse
roundish
roundly
roundness
roundsman
roundtable
roundup
roundwood
roundworm
roup
rous
rous sarcoma
rouse
rouseabout
rousement
rouser
rousing
rousingly
rousseau
rousseauesque
rousseauian
rousseauism
rousseauist
rousseauistic
roussillon
roust
roustabout
rouster
rout
route
route march
route step
routeman
router
routeway
routh
routine
routinely
routinization
routinize
roux
rouyn-noranda
rove
rove beetle
rover
roving
rovuma
row
