panzer vs army tank

panzer and army tank both are nouns.

Word	Noun	Adjective	Verb	Adverb
panzer	Yes	No	No	No
army tank	Yes	No	No	No

As nouns, army tank is a hypernym of panzer; that is, army tank is a word with a broader meaning than panzer:

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

Other hypernyms of panzer include armored combat vehicle, armoured combat vehicle, tank.

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