discourtesy vs manner

discourtesy and manner both are nouns.

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

As nouns, manner is a hypernym of discourtesy; that is, manner is a word with a broader meaning than discourtesy:

Other hypernyms of discourtesy include personal manner.

discourtesy (noun)	manner (noun)
a lack of politeness; a failure to show regard for others; wounding the feelings of others	a way of acting or behaving
a manner that is rude and insulting	how something is done or how it happens
an expression of lack of respect	a kind