Plural form of "man" men mans. Plural form of "child" children childs. Plural form of "foot" feet foots. Plural form of "thief" thieves thiefs. Plural form of "louse" lice louses. Plural form of "crisis" crises crisises. Plural form of "stimulus" stimuli" stimuluses. Plural form of "wife" wives wifes. Plural form of "study" studies studys. Plural form of "tomato" tomatoes tomatos. Plural form of "shelf" shelves shelfs. Plural form of "fox" foxes foxs. Plural form of "tooth" teeth thooths. Plural form of "ox" oxen oxes. Plural form of "sheep" sheep sheeps. Plural form of "goose" geese gooses. Plural form of "woman" women womans. Plural form of "butterfly" butterflies butterflys. Plural form of "medium" media mediums. Plural form of "lorry" lorries lorrys.