valiancy vs heroism

valiancy and heroism both are nouns.

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

As nouns, valiancy and heroism are synonyms defined as:

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

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

valiancy (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)