army tank vs armored combat vehicle

army tank and armored combat vehicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
army tank	Yes	No	No	No
armored combat vehicle	Yes	No	No	No

As nouns, army tank and armored combat vehicle are synonyms defined as:

army tank and armored combat vehicle: an enclosed armored military vehicle; has a cannon and moves on caterpillar treads

Other synonyms of army tank include armoured combat vehicle, tank.

army tank (noun)	armored combat vehicle (noun)
an enclosed armored military vehicle; has a cannon and moves on caterpillar treads	an enclosed armored military vehicle; has a cannon and moves on caterpillar treads