valour vs heroism

valour and heroism both are nouns.

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

As nouns, valour and heroism are synonyms defined as:

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

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

valour (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)