fox hole vs bunker

fox hole and bunker both are nouns.

Word	Noun	Adjective	Verb	Adverb
fox hole	Yes	No	No	No
bunker	Yes	No	Yes	No

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

fox hole: 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 fox hole include dugout.

fox hole (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

fox hole (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