courtesy vs discourtesy

courtesy and discourtesy both are nouns.

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

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