insisting vs purism

insisting and purism both are nouns.

Word	Noun	Adjective	Verb	Adverb
insisting	Yes	No	No	No
purism	Yes	No	No	No

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

insisting: continual and persistent demands
purism: scrupulous or exaggerated insistence on purity or correctness (especially in language)

insisting (noun)	purism (noun)
continual and persistent demands	scrupulous or exaggerated insistence on purity or correctness (especially in language)