army tank vs tracked vehicle

army tank and tracked vehicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
army tank	Yes	No	No	No
tracked vehicle	Yes	No	No	No

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

army tank: an enclosed armored military vehicle; has a cannon and moves on caterpillar treads
tracked vehicle: a self-propelled vehicle that moves on tracks

Other hypernyms of army tank include armored vehicle, armoured vehicle, military vehicle.

army tank (noun)	tracked vehicle (noun)
an enclosed armored military vehicle; has a cannon and moves on caterpillar treads	a self-propelled vehicle that moves on tracks