unconventional vs convention

unconventional is not a noun while convention is a noun.

Word	Noun	Adjective	Verb	Adverb
unconventional	No	Yes	No	No
convention	Yes	No	No	No

unconventional (noun)	convention (noun)
	the act of convening
	orthodoxy as a consequence of being conventional
	something regarded as a normative example
	(diplomacy) an international agreement
	a large formal assembly

unconventional (adjective)	convention (adjective)
not conforming to accepted rules or standards
not conventional or conformist
not conforming to legality, moral law, or social convention