nemertean vs nemertine

nemertean and nemertine both are nouns.

Word	Noun	Adjective	Verb	Adverb
nemertean	Yes	No	No	No
nemertine	Yes	No	No	No

As nouns, nemertean and nemertine are synonyms defined as:

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

Other synonyms of nemertean include proboscis worm, ribbon worm.

nemertean (noun)	nemertine (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