valour vs gallantry

valour and gallantry both are nouns.

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

As nouns, valour and gallantry are synonyms defined as:

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

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

valour (noun)	gallantry (noun)
the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle)	polite attentiveness to women
	the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle)
	courtesy towards women