unattractiveness vs ugliness

unattractiveness and ugliness both are nouns.

Word	Noun	Adjective	Verb	Adverb
unattractiveness	Yes	No	No	No
ugliness	Yes	No	No	No

As nouns, ugliness is a hypernym of unattractiveness; that is, ugliness is a word with a broader meaning than unattractiveness:

unattractiveness: an ugliness of appearance that is not appealing to viewers
ugliness: qualities of appearance that do not give pleasure to the senses

unattractiveness (noun)	ugliness (noun)
an ugliness of appearance that is not appealing to viewers	qualities of appearance that do not give pleasure to the senses
	the quality of being wicked