copepod vs copepod crustacean

copepod and copepod crustacean both are nouns.

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

As nouns, copepod and copepod crustacean are synonyms defined as:

copepod and 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

copepod (noun)	copepod crustacean (noun)
minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish	minute marine or freshwater crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish