How many words can you make out of safety matters?

At least 515. Here are some of them:

artiest

artiste

artistes

artists

artsiest

attires

estrays

fairest

fastest

fattier

fatties

fiestas

fissate

fitters

fraises

iratest

ratites

resifts

restaff

restaffs

satiety

satires

satisfy

sifters

sitters

staffer

staffers

starets

startsy

staters

stayers

stiffer

stiffest

strafes

straits

stratify

striate

striates

strifes

taffies

tariffs

tasters

tastier

testify

titfers

trystes

tsarist

yatters

yttrias