SIX
SIXAIN
SIXAINE
SIXAINES
SIXAINS
SIXER
SIXERS
SIXES
SIXFOLD
SIXMO
SIXMOS
SIXPENCE
SIXPENCES
SIXPENNIES
SIXPENNY
SIXSCORE
SIXSCORES
SIXTE
SIXTEEN
SIXTEENER
SIXTEENERS
SIXTEENMO
SIXTEENMOS
SIXTEENS
SIXTEENTH
SIXTEENTHLY
SIXTEENTHS
SIXTES
SIXTH
SIXTHLY
SIXTHS
SIXTIES
SIXTIETH
SIXTIETHS
SIXTY
SIXTYISH

36 words start with SIX.