flounder vs sand dab

flounder and sand dab both are nouns.

Word	Noun	Adjective	Verb	Adverb
flounder	Yes	No	Yes	No
sand dab	Yes	No	No	No

As nouns, sand dab is a hyponym of flounder; that is, sand dab is a word with a more specific, narrower meaning than flounder:

flounder: flesh of any of various American and European flatfish
sand dab: the lean flesh of a small flounder from the Pacific coast of North America

Other hyponyms of flounder include yellowtail flounder, plaice, turbot, lemon sole, winter flounder.

flounder (noun)	sand dab (noun)
any of various European and non-European marine flatfish	small food fishes of the Pacific coast of North America
flesh of any of various American and European flatfish	the lean flesh of a small flounder from the Pacific coast of North America

flounder (verb)	sand dab (verb)
walk with great difficulty
behave awkwardly; have difficulties