mountain chain vs formation

mountain chain and formation both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain chain	Yes	No	No	No
formation	Yes	No	No	No

As nouns, formation is a hypernym of mountain chain; that is, formation is a word with a broader meaning than mountain chain:

Other hypernyms of mountain chain include geological formation.

mountain chain (noun)	formation (noun)
a series of hills or mountains	the act of fabricating something in a particular shape
	the act of forming or establishing something
	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