liability vs ratability

liability and ratability both are nouns.

Word	Noun	Adjective	Verb	Adverb
liability	Yes	No	No	No
ratability	Yes	No	No	No

As nouns, ratability is a hyponym of liability; that is, ratability is a word with a more specific, narrower meaning than liability:

Other hyponyms of liability include taxability, rateability, joint liability.

liability (noun)	ratability (noun)
the quality of being something that holds you back	the quality of being capable of being rated or estimated
an obligation to pay money to another party	the state of being liable to assessment or taxation
the state of being legally obliged and responsible