primary vs important

primary is a noun but important is not a noun.

Word	Noun	Adjective	Verb	Adverb
primary	Yes	Yes	No	No
important	No	Yes	No	No

primary (noun)	important (noun)
a preliminary election where delegates or nominees are chosen
one of the main flight feathers projecting along the outer edge of a bird's wing
coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit
(astronomy) a celestial body (especially a star) relative to other objects in orbit around it

primary (adjective)	important (adjective)
of first rank or importance or value; direct and immediate rather than secondary	of great significance or value
of or being the essential or basic part	of extreme importance; vital to the resolution of a crisis
most important element	important in effect or meaning
not derived from or reducible to something else; basic	having or suggesting a consciousness of high position
	having authority or ascendancy or influence