roughness vs unpleasantness

roughness and unpleasantness both are nouns.

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

As nouns, unpleasantness is a hypernym of roughness; that is, unpleasantness is a word with a broader meaning than roughness:

roughness (noun)	unpleasantness (noun)
harsh or severe speech or behavior	the quality of giving displeasure
a texture of a surface or edge that is not smooth but is irregular and uneven	the feeling caused by disagreeable stimuli; one pole of a continuum of states of feeling
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