class Oligochaeta vs fishworm

class Oligochaeta and fishworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Oligochaeta	Yes	No	No	No
fishworm	Yes	No	No	No

class Oligochaeta (noun)	fishworm (noun)
earthworms	terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers