Based on https en wikipedia org wiki Noun Nouns have sometimes been defined in terms of the grammatical categories to which they are subject classed by gender inflected for case and number Such definitions tend to be language specific since nouns do not have the same categories in all languages Based on https://en.wikipedia.org/wiki/Noun, Nouns have sometimes been defined in terms of the grammatical categories to which they are subject (classed by gender, inflected for case and number). Such definitions tend to be language-specific, since nouns do not have the same categories in all languages.