companionability vs sociability

companionability and sociability both are nouns.

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

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

companionability: suitability to be a companion
sociability: the relative tendency or disposition to be sociable or associate with one's fellows

Other hypernyms of companionability include sociableness.

companionability (noun)	sociability (noun)
suitability to be a companion	the relative tendency or disposition to be sociable or associate with one's fellows