gregariousness vs sociability

gregariousness and sociability both are nouns.

Word	Noun	Adjective	Verb	Adverb
gregariousness	Yes	No	No	No
sociability	Yes	No	No	No

As nouns, sociability is a hypernym of gregariousness; that is, sociability is a word with a broader meaning than gregariousness:

gregariousness: the quality of being gregarious--having a dislike of being alone
sociability: the relative tendency or disposition to be sociable or associate with one's fellows

Other hypernyms of gregariousness include sociableness.

gregariousness (noun)	sociability (noun)
the quality of being gregarious--having a dislike of being alone	the relative tendency or disposition to be sociable or associate with one's fellows