polychete vs lobworm

polychete and lobworm both are nouns.

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

As nouns, lobworm is a hyponym of polychete; that is, lobworm 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
lobworm: marine worms having a row of tufted gills along each side of the back; often used for fishing bait

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

polychete (noun)	lobworm (noun)
chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles	marine worms having a row of tufted gills along each side of the back; often used for fishing bait