RARE
RAREBIT
RAREBITS
RARED
RAREE
RAREFACTION
RAREFACTIONAL
RAREFACTIONS
RAREFACTIVE
RAREFIABLE
RAREFICATION
RAREFICATIONAL
RAREFICATIONS
RAREFIED
RAREFIER
RAREFIERS
RAREFIES
RAREFY
RAREFYING
RARELY
RARENESS
RARENESSES
RARER
RARERIPE
RARERIPES
RARES
RAREST
RARIFIED
RARIFIES
RARIFY
RARIFYING
RARING
RARITIES
RARITY
RARK
RARKED
RARKING
RARKS

38 words start with RAR.