proboscis worm vs nemertean

proboscis worm and nemertean both are nouns.

Word	Noun	Adjective	Verb	Adverb
proboscis worm	Yes	No	No	No
nemertean	Yes	No	No	No

As nouns, proboscis worm and nemertean are synonyms defined as:

proboscis worm and nemertean: soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract

Other synonyms of proboscis worm include nemertine, ribbon worm.

proboscis worm (noun)	nemertean (noun)
soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract	soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract