The Grammar of English Grammars, page 610 by Gould Brown
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1. In some instances the syllable ess is simply added: as, _accuser, accuseress; advocate, advocatess; archer, archeress; author, authoress; avenger, avengeress; barber, barberess; baron, baroness; canon, canoness; cit, cittess;[161] coheir, coheiress; count, countess; deacon, deaconess; demon, demoness; diviner, divineress; doctor, doctoress; giant, giantess; god, goddess; guardian, guardianess; Hebrew, Hebrewess; heir, heiress; herd, herdess; hermit, hermitess; host, hostess; Jesuit, Jesuitess; Jew, Jewess; mayor, mayoress; Moabite, Moabitess; monarch, monarchess; pape, papess_; or, _pope, popess; patron, patroness; peer, peeress; poet, poetess; priest, priestess; prior, prioress; prophet, prophetess; regent, regentess; saint, saintess; shepherd, shepherdess; soldier, soldieress; tailor, tailoress; viscount, viscountess; warrior, warrioress_.
2. In other instances, the termination is changed, and there is no increase of syllables: as, _abbot, abbess; actor, actress; adulator, adulatress; adulterer, adulteress; adventurer, adventuress; advoutrer, advoutress; ambassador, ambassadress; anchorite, anchoress_; or, _anachoret, anachoress; arbiter, arbitress; auditor, auditress; benefactor, benefactress; caterer, cateress; chanter, chantress; cloisterer, cloisteress; commander, commandress; conductor, conductress; creator, creatress; demander, demandress; detractor, detractress; eagle, eagless; editor, editress; elector, electress; emperor, emperess_, or _empress; emulator, emulatress; enchanter, enchantress; exactor, exactress; fautor, fautress; fornicator, fornicatress; fosterer, fosteress_, or _fostress; founder, foundress; governor, governess; huckster, huckstress_; or, _hucksterer, hucksteress; idolater, idolatress; inhabiter, inhabitress; instructor, instructress; inventor, inventress; launderer, launderess_, or _laundress; minister, ministress; monitor, monitress; murderer, murderess; negro, negress; offender, offendress; ogre, ogress; porter, portress; progenitor, progenitress; protector,