courtesy vs remark

courtesy and remark both are nouns.

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

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

courtesy: a courteous or respectful or considerate remark
remark: a statement that expresses a personal opinion or belief or adds information

Other hypernyms of courtesy include comment, input.

courtesy (noun)	remark (noun)
a courteous or respectful or considerate act	explicit notice
a courteous manner	a statement that expresses a personal opinion or belief or adds information
a courteous or respectful or considerate remark

courtesy (verb)	remark (verb)
	make mention of
	make or write a comment on