unapproachability vs aloofness

unapproachability and aloofness both are nouns.

Word	Noun	Adjective	Verb	Adverb
unapproachability	Yes	No	No	No
aloofness	Yes	No	No	No

As nouns, aloofness is a hypernym of unapproachability; that is, aloofness is a word with a broader meaning than unapproachability:

unapproachability: a disposition to be unapproachable; unfriendly and inaccessible
aloofness: a disposition to be distant and unsympathetic in manner

Other hypernyms of unapproachability include remoteness, standoffishness, withdrawnness.

unapproachability (noun)	aloofness (noun)
a disposition to be unapproachable; unfriendly and inaccessible	a disposition to be distant and unsympathetic in manner
	indifference by personal withdrawal