decision vs firmness of purpose

decision and firmness of purpose both are nouns.

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

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

decision: the trait of resoluteness as evidenced by firmness of character or purpose
firmness of purpose: the trait of being resolute

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

decision (noun)	firmness of purpose (noun)
the act of making up your mind about something	the trait of being resolute
the trait of resoluteness as evidenced by firmness of character or purpose
a position or opinion or judgment reached after consideration
the outcome of a game or contest
(boxing) a victory won on points when no knockout has occurred