rateability vs ratability

rateability and ratability both are nouns.

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

As nouns, rateability and ratability are synonyms defined as:

rateability and ratability: the state of being liable to assessment or taxation

rateability (noun)	ratability (noun)
the state of being liable to assessment or taxation	the quality of being capable of being rated or estimated
	the state of being liable to assessment or taxation