fuel vs bunker

fuel and bunker both are nouns.

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

As verbs, bunker is a hyponym of fuel; that is, bunker is a word with a more specific, narrower meaning than fuel:

Other hyponyms of fuel include gas up, refuel.

fuel (noun)	bunker (noun)
a substance that can be consumed to produce energy	a hazard on a golf course
	a fortification of earth; mostly or entirely below ground
	a large container for storing fuel

fuel (verb)	bunker (verb)
stimulate	hit a golf ball into a bunker
provide with a combustible substance that provides energy	transfer cargo from a ship to a warehouse
provide with fuel	fill (a ship's bunker) with coal or oil
take in fuel, as of a ship