Crossword Genius

One may be common or proper (4)

Ross

I believe the answer is:

noun

(Other definitions for noun that I've seen before include "Substantive word" , "Word identifying person, place or thing" , "Word referring to person, place or thing" , "Identifying word (common or proper)" , "Content word for person, place, thing etc" .)

I've seen this clue in The Guardian.
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