tank driver vs soldier

tank driver and soldier both are nouns.

Word	Noun	Adjective	Verb	Adverb
tank driver	Yes	No	No	No
soldier	Yes	No	Yes	No

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

tank driver (noun)	soldier (noun)
a soldier who drives a tank	a wingless sterile ant or termite having a large head and powerful jaws adapted for defending the colony
	an enlisted man or woman who serves in an army

tank driver (verb)	soldier (verb)
	serve as a soldier in the military