RUC
RUCHE
RUCHED
RUCHES
RUCHING
RUCHINGS
RUCK
RUCKED
RUCKING
RUCKLE
RUCKLED
RUCKLES
RUCKLING
RUCKMAN
RUCKMEN
RUCKS
RUCKSACK
RUCKSACKS
RUCKSEAT
RUCKSEATS
RUCKUS
RUCKUSES
RUCOLA
RUCOLAS
RUCS
RUCTATION
RUCTATIONS
RUCTION
RUCTIONS
RUCTIOUS

30 words start with RUC.