heroism vs valour

heroism and valour both are nouns.

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

As nouns, heroism and valour are synonyms defined as:

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

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

heroism (noun)	valour (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)