gallantry vs chivalry

gallantry and chivalry both are nouns.

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

As nouns, gallantry and chivalry are synonyms defined as:

Other synonyms of gallantry include politesse.

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