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In all these cases, labels involve a particular part of speech: nouns. The trait ā€œliberalā€ is an adjective, but the category ā€œa liberalā€ is a noun. Saying that someone ā€œruns a lotā€ uses ā€œrunā€ as a verb, while saying someone is ā€œa runnerā€ turns that action (a verb) into an identity (a noun).