shortness vs discourtesy

shortness and discourtesy both are nouns.

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

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

Other hypernyms of shortness include rudeness.

shortness (noun)	discourtesy (noun)
an abrupt discourteous manner	a lack of politeness; a failure to show regard for others; wounding the feelings of others
the property of being shorter than average stature	a manner that is rude and insulting
the property of being of short temporal extent	an expression of lack of respect
the property of being of short spatial extent
the property of being truncated or short
the condition of being short of something