insistence vs purism

insistence and purism both are nouns.

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

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

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

insistence (noun)	purism (noun)
the act of insisting on something	scrupulous or exaggerated insistence on purity or correctness (especially in language)
continual and persistent demands
the state of demanding notice or attention