porn
(UK) IPA(key): /pɔːn/
(US) IPA(key): /pɔɹn/
https://en.m.wiktionary.org/wiki/porn

pawn
(UK) IPA(key): /pɔːn/
(US) IPA(key): /pɔn/
https://en.m.wiktionary.org/wiki/pawn