chowder vs corn chowder

chowder and corn chowder both are nouns.

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

As nouns, corn chowder is a hyponym of chowder; that is, corn 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
corn chowder: chowder containing corn

Other hyponyms of chowder include clam chowder, fish chowder.

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