A noun is a part of speech that describes a thing, person, place, event, concept or other substance or entity. Nouns in Portuguese are either masculine or feminine; the neuter, or genderless noun, has died out. In a great number of cases, it is usually possible to tell the gender of the noun from its ending. This document indicates whether a noun, or subset of nouns, are masculine or feminine, together with other groups of nouns which take an invariable masculine or feminine form, but may refer to persons or other entities of either gender.