13 letters

sportsmanship ∙ vestrymanship courtesanship charlatanship courtezanship subwardenship cocitizenship sovereignship chieftainship ∙ subdeaconship ∙ pendragonship ∙ companionship ∙ probationship justiciarship ∙ registrarship ∙ nonmembership ∙ artificership commandership ∙ pretendership ∙ remaindership volunteership gazetteership messengership scavengership harbingership coburghership publishership godfathership godmothership brigadiership grenadiership scrivenership ∙ foreignership containership ∙ pensionership copartnership ∙ landownership ∙ homeownership ∙ treasurership ∙ carpentership paymastership choristership barristership ∙ presbytership ∙ counselorship ∙ councilorship ∙ procensorship cosponsorship ∙ Successorship ∙ confessorship ∙ professorship ∙ possessorship ∙ escheatorship cocreatorship gladiatorship ∙ regulatorship moderatorship ∙ imperatorship ∙ spectatorship ∙ cunctatorship extractorship prelectorship collectorship ∙ inspectorship ∙ conrectorship correctorship prosectorship ∙ protectorship ∙ conductorship ∙ exhibitorship solicitorship ∙ subeditorship ∙ guarantorship succentorship ∙ precentorship ∙ preceptorship ∙ subpastorship prepostorship coadjutorship ∙ chauffeurship neighbourship patronessship intendantship postulantship ∙ Assistantship ∙ dilettantship presidentship ∙ paramountship bedfellowship disfellowship ∙ executrixship accessaryship secretaryship ∙ artilleryship virginityship pimperlimpimp rumbledethump ∙ disarchbishop plasmodiocarp

14 letters

figureheadship accompliceship apprenticeship ∙ precomradeship licentiateship ∙ magistrateship ∙ dilettanteship bumbailiffship underclerkship provincialship bridegroomship equestrianship subforemanship disworkmanship horsewomanship midshipmanship cochairmanship draughtmanship bipartisanship ∙ catechumenship ∙ subcaptainship archdeaconship commissionship protectionship antrustionship supercargoship ∙ subscribership ringleadership stadholdership ∙ landholdership freeholdership charioteership submanagership dressmakership victuallership controllership ∙ forerunnership subpartnership prepartnership slaveownership interownership timekeepership tidewaitership headmastership ∙ taskmastership postmastership ∙ soothsayership fellowheirship ambassadorship ∙ chancellorship ∙ counsellorship ∙ councillorship ∙ supervisorship ∙ anticensorship ∙ vindicatorship liquidatorship legislatorship ∙ translatorship arbitratorship subcuratorship procuratorship ∙ codictatorship benefactorship praelectorship codirectorship subproctorship instructorship ∙ proprietorship ∙ progenitorship ∙ inquisitorship competitorship prolocutorship ∙ handicraftship commandantship ∙ lieutenantship ∙ consultantship ∙ accountantship ∙ vicegerentship sweetheartship archpriestship ∙ evangelistship goodfellowship ∙ playfellowship clarenceuxship apothecaryship prebendaryship justiciaryship missionaryship commissaryship ∙ universityship photofloodlamp

15 letters

academicianship spokeswomanship draftswomanship sportswomanship outdoorsmanship ∙ draughtsmanship ∙ nonpartisanship ∙ nonpartizanship ∙ chamberlainship ∙ prechampionship prerelationship compotationship ∙ internuncioship shareholdership householdership ∙ stadtholdership ∙ archdapifership philosophership grandfathership gonfaloniership comptrollership ∙ parishionership probationership ∙ interpretership ∙ horsemastership housemastership burgomastership subgovernorship predecessorship nomenclatorship commentatorship conservatorship ∙ subdirectorship constructorship contributorship Distributorship connoisseurship ∙ demigoddessship tablefellowship subattorneyship referendaryship beneficiaryship

16 letters

understewardship acquaintanceship undersheriffship sublibrarianship metropolitanship churchwardenship intercitizenship steprelationship remembrancership subcommandership commissionership civilpartnership subtreasurership schoolmastership subprofessorship incorporatorship demonstratorship subcollectorship subinspectorship subprotectorship coproprietorship Entrepreneurship headmistressship schoolfellowship residentiaryship penitentiaryship subsecretaryship prothonotaryship supermastergroup

17 letters

primogenitureship undergraduateship draughtswomanship supersalesmanship colleaguesmanship interrelationship nostrummongership archtreasurership quartermastership subpostmastership administratorship correspondentship supernumeraryship subcommissaryship

18 letters

representativeship handicraftsmanship superintendentship undersecretaryship

19 letters

nonacquaintanceship historiographership subcommissionership plenipotentiaryship

Words with a ∙ are valid Scrabble words (SOWPODS word list)