tenaciousness vs purpose

tenaciousness and purpose both are nouns.

Word	Noun	Adjective	Verb	Adverb
tenaciousness	Yes	No	No	No
purpose	Yes	No	Yes	No

As nouns, purpose is a hypernym of tenaciousness; that is, purpose is a word with a broader meaning than tenaciousness:

tenaciousness: persistent determination
purpose: the quality of being determined to do or achieve something; firmness of purpose

Other hypernyms of tenaciousness include determination.

tenaciousness (noun)	purpose (noun)
persistent determination	what something is used for
	the quality of being determined to do or achieve something; firmness of purpose
	an anticipated outcome that is intended or that guides your planned actions

tenaciousness (verb)	purpose (verb)
	reach a decision
	propose or intend