politesse vs gallantry

politesse and gallantry both are nouns.

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

As nouns, politesse and gallantry are synonyms defined as:

Other synonyms of politesse include chivalry.

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