artillery vs weapon

artillery and weapon both are nouns.

Word	Noun	Adjective	Verb	Adverb
artillery	Yes	No	No	No
weapon	Yes	No	No	No

As nouns, artillery and weapon are synonyms defined as:

artillery (noun)	weapon (noun)
large but transportable armament	any instrument or instrumentality used in fighting or hunting
a means of persuading or arguing	a means of persuading or arguing
an army unit that uses big guns