bookworm vs purist

bookworm and purist both are nouns.

Word	Noun	Adjective	Verb	Adverb
bookworm	Yes	No	No	No
purist	Yes	No	No	No

As nouns, purist is a hyponym of bookworm; that is, purist is a word with a more specific, narrower meaning than bookworm:

bookworm: a person who pays more attention to formal rules and book learning than they merit
purist: someone who insists on great precision and correctness (especially in the use of words)

bookworm (noun)	purist (noun)
someone who spends a great deal of time reading	someone who insists on great precision and correctness (especially in the use of words)
a person who pays more attention to formal rules and book learning than they merit