discourtesy vs rudeness

discourtesy and rudeness both are nouns.

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

As nouns, discourtesy and rudeness are synonyms defined as:

discourtesy (noun)	rudeness (noun)
a lack of politeness; a failure to show regard for others; wounding the feelings of others	a manner that is rude and insulting
a manner that is rude and insulting	a wild or unrefined state
an expression of lack of respect