heroism vs valiancy

heroism and valiancy both are nouns.

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

As nouns, heroism and valiancy are synonyms defined as:

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

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

heroism (noun)	valiancy (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)