politeness vs courtesy

politeness and courtesy both are nouns.

Word	Noun	Adjective	Verb	Adverb
politeness	Yes	No	No	No
courtesy	Yes	No	No	No

As nouns, courtesy is a hyponym of politeness; that is, courtesy is a word with a more specific, narrower meaning than politeness:

Other hyponyms of politeness include deference, respect, devoir.

As nouns, courtesy is a hypernym of politeness; that is, courtesy is a word with a broader meaning than politeness:

Other hypernyms of politeness include good manners.

politeness (noun)	courtesy (noun)
the act of showing regard for others	a courteous or respectful or considerate act
a courteous manner that respects accepted social usage	a courteous manner
	a courteous or respectful or considerate remark