convention vs conventional

convention is a noun but conventional is not a noun.

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

convention (noun)	conventional (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

convention (adjective)	conventional (adjective)
	following accepted customs and proprieties
	unimaginative and conformist
	(weapons) using energy for propulsion or destruction that is not nuclear energy
	rigidly formal or bound by convention
	represented in simplified or symbolic form
	conforming with accepted standards
	in accord with or being a tradition or practice accepted from the past