election vs primary

election and primary both are nouns.

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

As nouns, primary is a hyponym of election; that is, primary is a word with a more specific, narrower meaning than election:

Other hyponyms of election include reelection, general election, primary election, by-election, bye-election, runoff.

election (noun)	primary (noun)
the act of selecting someone or something; the exercise of deliberate choice	a preliminary election where delegates or nominees are chosen
a vote to select the winner of a position or political office	one of the main flight feathers projecting along the outer edge of a bird's wing
the predestination of some individuals as objects of divine mercy (especially as conceived by Calvinists)	coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit
the status or fact of being elected	(astronomy) a celestial body (especially a star) relative to other objects in orbit around it

election (adjective)	primary (adjective)
	of first rank or importance or value; direct and immediate rather than secondary
	of or being the essential or basic part
	most important element
	not derived from or reducible to something else; basic