discourtesy vs courtesy

discourtesy and courtesy both are nouns.

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

discourtesy (noun)	courtesy (noun)
a lack of politeness; a failure to show regard for others; wounding the feelings of others	a courteous or respectful or considerate act
a manner that is rude and insulting	a courteous manner
an expression of lack of respect	a courteous or respectful or considerate remark