formation vs rifling

formation and rifling both are nouns.

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

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

formation: the act of fabricating something in a particular shape
rifling: the cutting of spiral grooves on the inside of the barrel of a firearm

Other hyponyms of formation include filing, forging, metalwork, metalworking, granulation, grooving, turning.

formation (noun)	rifling (noun)
the act of fabricating something in a particular shape	the cutting of spiral grooves on the inside of the barrel of a firearm
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