foxhole vs bunker

foxhole and bunker both are nouns.

Word	Noun	Adjective	Verb	Adverb
foxhole	Yes	No	No	No
bunker	Yes	No	Yes	No

As nouns, bunker is a hypernym of foxhole; that is, bunker is a word with a broader meaning than foxhole:

foxhole: a small dugout with a pit for individual shelter against enemy fire
bunker: a fortification of earth; mostly or entirely below ground

Other hypernyms of foxhole include dugout.

foxhole (noun)	bunker (noun)
a small dugout with a pit for individual shelter against enemy fire	a hazard on a golf course
	a fortification of earth; mostly or entirely below ground
	a large container for storing fuel

foxhole (verb)	bunker (verb)
	hit a golf ball into a bunker
	transfer cargo from a ship to a warehouse
	fill (a ship's bunker) with coal or oil