copepod vs brit

copepod and brit both are nouns.

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

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

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

Other hyponyms of copepod include britt, cyclops, water flea, fish louse.

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