gruffness vs discourtesy

gruffness and discourtesy both are nouns.

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

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

Other hypernyms of gruffness include rudeness.

gruffness (noun)	discourtesy (noun)
a throaty harshness	a lack of politeness; a failure to show regard for others; wounding the feelings of others
an abrupt discourteous manner	a manner that is rude and insulting
	an expression of lack of respect