firmness of purpose vs trait

firmness of purpose and trait both are nouns.

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

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

firmness of purpose (noun)	trait (noun)
the trait of being resolute	a distinguishing feature of your personal nature