chivalry vs gallantry

chivalry and gallantry both are nouns.

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

As nouns, chivalry and gallantry are synonyms defined as:

Other synonyms of chivalry include politesse.

chivalry (noun)	gallantry (noun)
courtesy towards women	polite attentiveness to women
the medieval principles governing knighthood and knightly conduct	the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle)
	courtesy towards women