brit vs copepod crustacean

brit and copepod crustacean both are nouns.

Word	Noun	Adjective	Verb	Adverb
brit	Yes	No	No	No
copepod crustacean	Yes	No	No	No

As nouns, copepod crustacean is a hypernym of brit; that is, copepod crustacean is a word with a broader meaning than brit:

brit: minute crustaceans forming food for right whales
copepod crustacean: minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish

Other hypernyms of brit include copepod.

brit (noun)	copepod crustacean (noun)
the young of a herring or sprat or similar fish	minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish
minute crustaceans forming food for right whales