formation vs backfield

formation and backfield both are nouns.

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

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

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

formation (noun)	backfield (noun)
the act of fabricating something in a particular shape	the offensive football players who line up behind the linemen
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