formation vs secondary

formation and secondary both are nouns.

Word	Noun	Adjective	Verb	Adverb
formation	Yes	No	No	No
secondary	Yes	Yes	No	No

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

Other hyponyms of formation include flight, military formation, backfield, line, line, center, centre, flank, wing, head, rear.

formation (noun)	secondary (noun)
the act of fabricating something in a particular shape	coil such that current is induced in it by passing a current through the primary coil
the act of forming or establishing something	the defensive football players who line up behind the linemen
creation by mental activity
a particular spatial arrangement
an arrangement of people or things acting as a unit
(geology) the geological features of the earth
natural process that causes something to form

formation (adjective)	secondary (adjective)
	being of second rank or importance or value; not direct or immediate
	depending on or incidental to what is original or primary
	inferior in rank or status
	not of major importance
	belonging to a lower class or rank