3-letter words

Ons oof ooh ook oom ooo OOP oot opa ope ops opt ora orb orc ord ore Ori Orr Oso oss Ota oto ott oui our out owe owl own owt oxy Pac pad pah Pak pal pam Pan pao pap par pas pat pau paw pax pay Paz pea ped pee peg Pei pel pen pep per pet pew Pez pff phi pho Phu pia pic pie pig Pil Pim pin Pio pip pit Pla ply PMS pod Poe poi pol pom pon pop POR pot pow pox pre pro Pru pry psh psi PTA pub pud pug