heroism vs valiance

heroism and valiance both are nouns.

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

As nouns, heroism and valiance are synonyms defined as:

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

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

heroism (noun)	valiance (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)