tirelessness vs purpose

tirelessness and purpose both are nouns.

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

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

tirelessness: tireless determination
purpose: the quality of being determined to do or achieve something; firmness of purpose

Other hypernyms of tirelessness include determination.

tirelessness (noun)	purpose (noun)
tireless 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

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