lexical class
Definition - (Aka word class)

One of several modern names for what was traditionally called a part of speech, i.e. one of the set of grammatical categories to which words can be assigned.

Example -
The black in black cat is a member of the lexical class adjective.

Oxford English Dictionary -
The term's first citation is from 1963:
"All lexical units generated from the same grammatical unit by the same lexical rule are said to belong to a single lexical class."
(Bloomfield & Newmark Ling. Introd. Hist. Eng. iv. 145)

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