roughness vs gruffness

roughness and gruffness both are nouns.

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

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

Other hyponyms of roughness include hoarseness, huskiness.

roughness (noun)	gruffness (noun)
harsh or severe speech or behavior	a throaty harshness
a texture of a surface or edge that is not smooth but is irregular and uneven	an abrupt discourteous manner
the quality of being harsh or rough or grating to the senses
an unpolished unrefined quality
the formation of small pits in a surface as a consequence of corrosion
used of the sea during inclement or stormy weather
rowdy behavior