serviceableness vs serviceable

serviceableness is a noun but serviceable is not a noun.

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

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

serviceableness (adjective)	serviceable (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