Subject of the biography The Right Word (5)

I believe the answer is:

roget

(Other definitions for roget that I've seen before include "Thesaurus inventor" , "lexicographer" , "English doctor, compiler of a thesaurus, d. 1869" , "English physician and thesaurus compiler, d. 1869" , "Thesaurus writer" .)

I've seen this clue in the Newsday.

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