half track vs tracked vehicle

half track and tracked vehicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
half track	Yes	No	No	No
tracked vehicle	Yes	No	No	No

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

half track: a motor vehicle propelled by half tracks; frequently used by the military
tracked vehicle: a self-propelled vehicle that moves on tracks

Other hypernyms of half track include military vehicle.

half track (noun)	tracked vehicle (noun)
a track that goes around only rear wheels	a self-propelled vehicle that moves on tracks
a motor vehicle propelled by half tracks; frequently used by the military