peanut worm vs sipunculid

peanut worm and sipunculid both are nouns.

Word	Noun	Adjective	Verb	Adverb
peanut worm	Yes	No	No	No
sipunculid	Yes	No	No	No

As nouns, peanut worm and sipunculid are synonyms defined as:

peanut worm and sipunculid: small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut

peanut worm (noun)	sipunculid (noun)
small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut	small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut