britt vs copepod

britt and copepod both are nouns.

Word	Noun	Adjective	Verb	Adverb
britt	Yes	No	No	No
copepod	Yes	No	No	No

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

britt: minute crustaceans forming food for right whales
copepod: 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 britt include copepod crustacean.

britt (noun)	copepod (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