Irregular plurals

No change	deer-deer offspring-offspring	fish-fish sheep-sheep	moose-moose species-species
oo – ee	foot-feet	goose-geese	tooth-teeth
Suffix -en	brother-brethren (archaic) ox-oxen	child-children woman -women	man-men
ou – i…e	louse-lice	mouse-mice
o + suffix -es	banjo-banjo(e)s dingo – dingoes embargo – embargoes ghetto – ghetto(es) hobo – hoboes mosquito – mosquito(e)s tomato – tomatoes tuxedo-tuxedo(e)s	buffalo-buffalo(e)s domino – domino(e)s flamingo – flamingo(e)s halo – halo(e)s mango – mango(e)s motto – motto(e)s tornado – tornadoes veto – vetoes	cargo – cargo(e)s echo – echoes gecko – geckoes hero – heroes memento – memento(e)s potato – potatoes torpedo – torpedoes volcano – volcano(e)s
us – i	alumnus – alumni cactus – cacti focus – foci nucleus – nuclei terminus – termini	bacillus – bacilli calculus – calculi fungus – fungi radius – radii	bronchus – bronchi embolus – emboli meniscus – menisci stimulus – stimuli
is – es	anastomosis – anastomoses basis – bases ellipsis – ellipses neurosis – neuroses parenthesis –parentheses synthesis – syntheses	axis – axes crisis – crises emphasis – emphases oasis – oases prognosis – prognoses synopsis -synopses	analysis – analyses diagnosis – diagnoses hypothesis – hypotheses paralysis – paralyses prosthesis – prostheses thesis – theses
eau – eaux	bandeau – bandeaux chateau – chateaux plateau – plateaux tonneau – tonneaux	beau – beax flambeau – flambeaux portmanteau -portmanteaux trousseau – trousseaux	bureau – bureaux gateau – gateaux tableau – tableaux
a – ae	alga – algae formula – formulae vertebra – vertebrae	amoeba – amoebae larva – larvae vita -vitae	antenna – antennae nebula – nebulae
ex – es	apex – apices index – indices vortex – vortices	cervix – cervices matrix – matrices	appendix – appendices vertex – vertices
um – a	addendum – addenda datum – data epithelium – epithelia ovum – ova	bacterium – bacteria erratum – errata medium – media stratum – strata	curriculum – curricula diverticulum – diverticula memorandum – memoranda symposium – symposia
on – a	automaton – automata phenomenon – phenomena	criterion – criteria spermatozoon – spermatozoa	ganglion – ganglia
us – a	corpus – corpora	genus – genera
en – a	foramen – foramina	lumen – lumina
o – i	libretto – libretti	tempo – tempi	virtuoso – virtuosi
Suffix -im	cherub – cherubim	seraph – seraphim