riveting machine vs rivetter

riveting machine and rivetter both are nouns.

Word	Noun	Adjective	Verb	Adverb
riveting machine	Yes	No	No	No
rivetter	Yes	No	No	No

As nouns, riveting machine and rivetter are synonyms defined as:

Other synonyms of riveting machine include riveter.

riveting machine (noun)	rivetter (noun)
a machine for driving rivets	a machine for driving rivets
	a worker who inserts and hammers rivets