Mammoth Uncensored Word List:
81 words ending with ps, 12 letters long

achaenocarps admiralships adviserships amateurships apostleships artisanships athwartships auditorships bailiffships baillieships basidiocarps batsmanships bencherships bondmanships bushmanships captainships chapmanships citizenships clubmanships colonelships comradeships corivalships coronerships countercoups countersteps creatorships curatorships denizenships dipterocarps electorships emperorships foremanships generalships grandeeships janitorships justiceships kindredships lectureships lifemanships magnateships managerships marshalships messiahships monitorships mountaintops oarsmanships overdevelops partnerships patroonships plowmanships praetorships prefectships prelateships premierships primateships proctorships prophetships provostships questorships scholarships senatorships servantships sheriffships showmanships soldierships speakerships sponsorships stewardships studentships subjectships surgeonships teacherships thunderclaps traineeships traitorships tribuneships trusteeships vaivodeships viceroyships voivodeships workmanships