flatfish vs sole

flatfish and sole both are nouns.

Word	Noun	Adjective	Verb	Adverb
flatfish	Yes	No	No	No
sole	Yes	Yes	Yes	No

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

flatfish: any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side
sole: right-eyed flatfish; many are valued as food; most common in warm seas especially European

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

flatfish: sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets
sole: lean flesh of any of several flatfish

Other hyponyms of flatfish include flounder, fillet of sole, halibut.

flatfish (noun)	sole (noun)
any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side	right-eyed flatfish; many are valued as food; most common in warm seas especially European
sweet lean whitish flesh of any of numerous thin-bodied fish; usually served as thin fillets	the underside of footwear or a golf club
	the underside of the foot
	lean flesh of any of several flatfish

flatfish (adjective)	sole (adjective)
	being the only one; single and isolated from others
	not divided or shared with others

flatfish (verb)	sole (verb)
	put a new sole on