astronomy vs primary

astronomy and primary both are nouns.

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

astronomy (noun)	primary (noun)
the branch of physics that studies celestial bodies and the universe as a whole	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

astronomy (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