fearlessness vs courage

fearlessness and courage both are nouns.

Word	Noun	Adjective	Verb	Adverb
fearlessness	Yes	No	No	No
courage	Yes	No	No	No

As nouns, courage is a hypernym of fearlessness; that is, courage is a word with a broader meaning than fearlessness:

fearlessness: the trait of feeling no fear
courage: a quality of spirit that enables you to face danger or pain without showing fear

Other hypernyms of fearlessness include braveness, bravery, courageousness.

fearlessness (noun)	courage (noun)
the trait of feeling no fear	a quality of spirit that enables you to face danger or pain without showing fear
feeling no fear