spunk vs lighter

spunk and lighter both are nouns.

Word	Noun	Adjective	Verb	Adverb
spunk	Yes	No	No	No
lighter	Yes	No	Yes	No

As nouns, lighter is a hypernym of spunk; that is, lighter is a word with a broader meaning than spunk:

Other hypernyms of spunk include igniter, ignitor.

spunk (noun)	lighter (noun)
the courage to carry on	a device for lighting or igniting fuel or charges or fires
material for starting a fire	a flatbottom boat for carrying heavy loads (especially on canals)
	a substance used to ignite or kindle a fire

spunk (verb)	lighter (verb)
	transport in a flatbottom boat