serviceable vs serviceability

serviceable is not a noun while serviceability is a noun.

Word	Noun	Adjective	Verb	Adverb
serviceable	No	Yes	No	No
serviceability	Yes	No	No	No

serviceable (noun)	serviceability (noun)
	the quality of being able to provide good service

serviceable (adjective)	serviceability (adjective)
ready for service or able to give long service
intended or able to serve a purpose without elaboration
capable of being put to good use