lighter vs scow

lighter and scow both are nouns.

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

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

Other hyponyms of lighter include dredger, houseboat, pontoon, Norfolk wherry, wherry.

lighter (noun)	scow (noun)
a device for lighting or igniting fuel or charges or fires	a barge carrying bulk materials in an open hold
a flatbottom boat for carrying heavy loads (especially on canals)	any of various flat-bottomed boats with sloping ends
a substance used to ignite or kindle a fire

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