polychete vs bloodworm

polychete and bloodworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
polychete	Yes	No	No	No
bloodworm	Yes	No	No	No

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

polychete: chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles
bloodworm: a segmented marine worm with bright red body; often used for bait

Other hyponyms of polychete include lobworm, lug, lugworm, sea mouse.

polychete (noun)	bloodworm (noun)
chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles	a segmented marine worm with bright red body; often used for bait