chowder vs fish chowder

chowder and fish chowder both are nouns.

Word	Noun	Adjective	Verb	Adverb
chowder	Yes	No	No	No
fish chowder	Yes	No	No	No

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

chowder: a thick soup or stew made with milk and bacon and onions and potatoes
fish chowder: chowder containing fish

Other hyponyms of chowder include corn chowder, clam chowder.

chowder (noun)	fish chowder (noun)
a thick soup or stew made with milk and bacon and onions and potatoes	chowder containing fish