horned pout vs bullhead catfish

horned pout and bullhead catfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
horned pout	Yes	No	No	No
bullhead catfish	Yes	No	No	No

As nouns, bullhead catfish is a hypernym of horned pout; that is, bullhead catfish is a word with a broader meaning than horned pout:

horned pout: catfish common in eastern United States
bullhead catfish: any of several common freshwater catfishes of the United States

Other hypernyms of horned pout include bullhead.

horned pout (noun)	bullhead catfish (noun)
catfish common in eastern United States	any of several common freshwater catfishes of the United States