All words belong to a word class. It’s that word’s type: nouns, verbs, adjectives, adverbs, pronouns, prepositions, conjunctions, determiners and exclamations. These are all word classes. Consider the ...

Nouns are by far the largest category of words in English. They signify all kinds of physical things both living and inanimate. They also signify imagined things like ‘a ghost’; and ideas or concepts, ...