Mammoth Uncensored Word List:
74 words ending with p, 12 letters long

aldermanship assessorship attorneyship bachelorship brinkmanship cardinalship chairmanship championship chaplainship chimneysweep coauthorship coeditorship consumership convenership convenorship corporalship corrivalship counterscarp craftmanship creatureship deemstership dictatorship directorship discipleship domestichelp examinership executorship followership freshmanship gamesmanship governorship graduateship guardianship helmsmanship horsemanship huntsmanship laureateship listenership marksmanship mediatorship ministership musicianship nonownership overlordship partisanship partizanship postworkshop preachership prenticeship quaestorship receivership recordership registership relationship residentship retainership salesmanship seigniorship sergeantship serjeantship servitorship sinecureship spinstership superiorship surveyorship survivorship underdevelop unfriendship virtuosoship viscountship watermanship weatherstrip wordsmanship wranglership