rifling vs grooving

rifling and grooving both are nouns.

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

As nouns, rifling and grooving are synonyms defined as:

rifling and grooving: the cutting of spiral grooves on the inside of the barrel of a firearm

rifling (noun)	grooving (noun)
the cutting of spiral grooves on the inside of the barrel of a firearm	the cutting of spiral grooves on the inside of the barrel of a firearm