courtesy vs deference

courtesy and deference both are nouns.

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

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

courtesy (noun)	deference (noun)
a courteous or respectful or considerate act	a courteous expression (by word or deed) of esteem or regard
a courteous manner	a disposition or tendency to yield to the will of others
a courteous or respectful or considerate remark	courteous regard for people's feelings