purpose vs firmness

purpose and firmness both are nouns.

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

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

purpose: the quality of being determined to do or achieve something; firmness of purpose
firmness: the trait of being resolute

Other hypernyms of purpose include firmness of purpose, resoluteness, resolution, resolve.

purpose (noun)	firmness (noun)
what something is used for	the quality of being steady or securely and immovably fixed in place
the quality of being determined to do or achieve something; firmness of purpose	the trait of being resolute
an anticipated outcome that is intended or that guides your planned actions	the property of being unyielding to the touch
	the muscle tone of healthy tissue

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