gallantry vs valour

gallantry and valour both are nouns.

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

As nouns, gallantry and valour are synonyms defined as:

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

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

gallantry (noun)	valour (noun)
polite attentiveness to women	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)
courtesy towards women