discourtesy vs abuse

discourtesy and abuse both are nouns.

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

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

discourtesy (noun)	abuse (noun)
a lack of politeness; a failure to show regard for others; wounding the feelings of others	improper or excessive use
a manner that is rude and insulting	cruel or inhumane treatment
an expression of lack of respect	a rude expression intended to offend or hurt

discourtesy (verb)	abuse (verb)
	change the inherent purpose or function of something
	use wrongly or improperly or excessively
	use foul or abusive language towards
	treat badly