introversion vs unsociability

introversion and unsociability both are nouns.

Word	Noun	Adjective	Verb	Adverb
introversion	Yes	No	No	No
unsociability	Yes	No	No	No

As nouns, unsociability is a hypernym of introversion; that is, unsociability is a word with a broader meaning than introversion:

introversion: (psychology) an introverted disposition; concern with one's own thoughts and feelings
unsociability: an unsociable disposition; avoiding friendship or companionship

Other hypernyms of introversion include unsociableness.

introversion (noun)	unsociability (noun)
(psychology) an introverted disposition; concern with one's own thoughts and feelings	an unsociable disposition; avoiding friendship or companionship
the folding in of an outer layer so as to form a pocket in the surface
the condition of being folded inward or sheathed