valour vs valorousness

valour and valorousness both are nouns.

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

As nouns, valour and valorousness are synonyms defined as:

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

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

valour (noun)	valorousness (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)