Mammoth Uncensored Word List:
27 words ending with ir, 9 letters long

acyclovir antechoir aspersoir backspeir backstair bathchair camelhair centumvir crosshair deckchair disrepair downstair forestair headchair highchair horsehair indinavir pushchair remontoir reservoir ritonavir septemvir shorthair sidechair underhair wasteweir wingchair