FAS
FASCES
FASCI
FASCIA
FASCIAE
FASCIAL
FASCIAS
FASCIATE
FASCIATED
FASCIATELY
FASCIATION
FASCIATIONS
FASCICLE
FASCICLED
FASCICLES
FASCICULAR
FASCICULARLY
FASCICULATE
FASCICULATED
FASCICULATELY
FASCICULATION
FASCICULATIONS
FASCICULE
FASCICULES
FASCICULI
FASCICULUS
FASCIITIS
FASCIITISES
FASCINATE
FASCINATED
FASCINATEDLY
FASCINATES
FASCINATING
FASCINATINGLY
FASCINATION
FASCINATIONS
FASCINATIVE
FASCINATOR
FASCINATORS
FASCINE
FASCINES
FASCIO
FASCIOLA
FASCIOLAS
FASCIOLE
FASCIOLES
FASCIOLIASES
FASCIOLIASIS
FASCIS
FASCISM
FASCISMI
FASCISMO
FASCISMS
FASCIST
FASCISTA
FASCISTI
FASCISTIC
FASCISTICALLY
FASCISTS
FASCITIS
FASCITISES
FASH
FASHED
FASHERIES
FASHERY
FASHES
FASHING
FASHION
FASHIONABILITY
FASHIONABLE
FASHIONABLENESS
FASHIONABLES
FASHIONABLY
FASHIONED
FASHIONER
FASHIONERS
FASHIONING
FASHIONIST
FASHIONISTA
FASHIONISTAS
FASHIONISTS
FASHIONMONGER
FASHIONMONGERS
FASHIONMONGING
FASHIONS
FASHIONY
FASHIOUS
FASHIOUSNESS
FASHIOUSNESSES
FAST
FASTBACK
FASTBACKS
FASTBALL
FASTBALLER
FASTBALLERS
FASTBALLS
FASTED
FASTEN
FASTENED
FASTENER
FASTENERS
FASTENING
FASTENINGS
FASTENS
FASTER
FASTERS
FASTEST
FASTI
FASTIDIOUS
FASTIDIOUSLY
FASTIDIOUSNESS
FASTIE
FASTIES
FASTIGIATE
FASTIGIATED
FASTIGIUM
FASTIGIUMS
FASTING
FASTINGS
FASTISH
FASTLY
FASTNESS
FASTNESSES
FASTS
FASTUOUS

125 words start with FAS.