field artillery vs artillery

field artillery and artillery both are nouns.

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

As nouns, artillery is a hypernym of field artillery; that is, artillery is a word with a broader meaning than field artillery:

field artillery: movable artillery (other than antiaircraft) used by armies in the field (especially for direct support of front-line troops)
artillery: large but transportable armament

Other hypernyms of field artillery include gun, heavy weapon, ordnance.

field artillery (noun)	artillery (noun)
movable artillery (other than antiaircraft) used by armies in the field (especially for direct support of front-line troops)	large but transportable armament
	a means of persuading or arguing
	an army unit that uses big guns