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a set of words that display the same formal (linguistic) properties, especially their inflections and distribution.

Word class (similar to part of speech) is a set of words that display the same formal properties, especially their inflections and distribution.

Types:

1) lexical (or open or form) classes (nouns, verbs, adjectives, adverbs) 2) function (or closed or structure) classes (determiners, particles, prepositions etc.).