artilleryman vs cannoneer

artilleryman and cannoneer both are nouns.

Word	Noun	Adjective	Verb	Adverb
artilleryman	Yes	No	No	No
cannoneer	Yes	No	No	No

As nouns, artilleryman and cannoneer are synonyms defined as:

Other synonyms of artilleryman include gunner, machine gunner.

artilleryman (noun)	cannoneer (noun)
a serviceman in the artillery	a serviceman in the artillery