lighter vs spunk

lighter and spunk both are nouns.

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

As nouns, spunk is a hyponym of lighter; that is, spunk is a word with a more specific, narrower meaning than lighter:

Other hyponyms of lighter include firelighter, kindling, punk, tinder, touchwood, punk.

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

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