valor vs heroism

valor and heroism both are nouns.

Word	Noun	Adjective	Verb	Adverb
valor	Yes	No	No	No
heroism	Yes	No	No	No

As nouns, valor and heroism are synonyms defined as:

valor and heroism: the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle)

Other synonyms of valor include gallantry, valiance, valiancy, valorousness, valour.

valor (noun)	heroism (noun)
the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle)	the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle)