convenient vs convenience

convenient is not a noun while convenience is a noun.

Word	Noun	Adjective	Verb	Adverb
convenient	No	Yes	No	No
convenience	Yes	No	No	No

convenient (noun)	convenience (noun)
	a device or control that is very useful for a particular job
	a toilet that is available to the public
	the quality of being useful and convenient
	the state of being suitable or opportune

convenient (adjective)	convenience (adjective)
suited to your comfort or purpose or needs
large and roomy (`convenient' is archaic in this sense)