English noun/Catalogs/English irregular nouns

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Template:English irregular nouns footerThe normal way to form a plural noun in English is to add -s. Words ending in -ŷ add -íes. But there are also many irregular nouns, some with English roots, others with plural forms from Latin, Greek, French, Italian and Hebrew. (The accents, which are not part of the language, are included to show stress and pronunciation: see English spellings for a table and English phonemes for the IPA. Words in italics suggest meaning, and an equals sign is placed between homophones.)

Nouns in -o which always have -ôes in the plural are included in the table below; others are regular, having -ôs, while búffalo, càrgo, hâlo, mosquìto (-k-), mótto, nô, tornâdo, volcâno and zêro can be seen with both -ôs and -ôes.

Nouns in -us which always have -î in the plural are listed below, while cáctus, fôcus, fúngus, óctopus and sýllabus can have both -î and -uses.

Nouns in -sís (-ssíss), análysis, áxis, bâsis, crîsis, diagnôsis, émphasis, hypóthesis, neurôsis, oâsis, parénthesis, synópsis, sýnthesis and thêsis have their plurals in -sês (-ssêez): análysês (*ənáləssêez) etc.

Nouns in -ndum, addéndum, referéndum and memorándum, change to -nda: addénda, referénda, memoránda.

Apart from vŏrtex, plural vŏrtices (-tíssêez), nouns in -ex and -íx (âpex, appéndix, cërvix, índex and mâtrix) have plurals in both -ícês and -íxes (-íxíz).

The following have the same form in the singular and plural: bárracks, cód, cróssroads, dêer animal (= dêar loved, expensive), dîce, físh (dîe as the singular of dîce and físhes as the plural of físh are archaic), gállows, hálibut, héadquarters, mêans, óffspring, përch fish (përch position has përches), pîke, sálmon (*sámmon), sêries, shêep, spêcies (-shíz), tròut and tûna.

Prefixed nouns are not included if their plural endings are the same as that of the root noun: for example the plural of snôwmán is snôwmén.

Table of irregular nouns

Singular	Plural
bactêrium	bactêria
chîld	chíldren
goôse	gêese
lôaf	lôaves
nûclêus	nûclêî
phenómenon	phenómena
vŏrtex	vŏrticês (-íssêez)

Comprehensive list

Singular Plural alùmnus alùmnî BrE amoêba, AmE amêba BrE amoêbaê, amoêbas, AmE amêbê, amêbas anténna anténnaê BrE, AmE anténnê, both anténnas autómaton autómata, autómatons bacíllus bacíllî bactêrium bactêria bâsis bâsês (*bâyssêez, cf. bâses base *bâyssíz = bâsses music) bròther church bréthren (-dh-; bròther family is regular: bròthers) cālf (*cāf) cālves (*cāvz) chérub chérubìm chîld chíldren cŏrpus cŏrpora critêrion critêria (both -î-) currículum currícula, currículums dâtum, dàtum BrE dâta, AmE dáta écho échôes (both ék-) élf élves embàrgo embàrgôes errātum errāta fôcus fôcuses, fôcî (*fôassî) foòt fêet fŏrmula fŏrmulaê, fŏrmulas gênie gênìî (both j-; cf. gêniuses, plural of gênius) génus génera (both j-) gladiôlus gladiôlî goôse gêese hālf (*hāf) hālves (*hāvz, cf. háves, plural of háve) hêro hêrôes hoôf hoôves kibbùtz kibbùtzìm knîfe knîves (both n-) làrva BrE làrvaê, AmE làrvê lêaf lêaves (= lêaves leaving) librétto libréttì lîfe lîves (cf. líves dwells) lòuse lîce lôcus lôcî (*lôassî) lôaf lôaves mán mén mêdium communication mêdia (with other meanings, mêdium is regular: mêdiums) mòuse mîce nébula nébulaê, nébulas nûclêus nûclêî ôvum ôva eggs (= BrE ôver above, finished) óx óxen përson pêople (pêp-), përsons (the latter is more formal) phenómenon phenómena pláteau (*plátô) pláteaux (*plátôz; in both, the second syllable is stressed in AmE) potâto potâtoes râdius râdìî scàrf scàrves schêma schemàta (both sk-) sélf sélves séraph séraphìm shêaf shêaves stímulus stímulî stràtum BrE, AmE strâtum stràta BrE, AmE strâta (= BrE strâighter) sympôsium sympôsia tábleau (*táblô) tábleaux (*táblôz) témpo témpì tërminus tërminî thìêf thìêves thêsis thêsês (-sêez) BrE tomàto, AmE tomâto BrE tomàtoes, AmE tomâtoes toôth têeth torpêdo torpêdoes vërtebra vërtebraê vêto vêtôes vïrtuôso vïrtuôsì (both -ûôss-) vŏrtex vŏrticês (-íssêez) wîfe wîves wolf (= Woòlf person) wolves (*wùlvz) woman (wù-) women (wí-)