abuse vs discourtesy

abuse and discourtesy both are nouns.

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

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

Other hypernyms of abuse include disrespect.

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

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