Nemertea vs phylum

Nemertea and phylum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nemertea	Yes	No	No	No
phylum	Yes	No	No	No

As nouns, phylum is a hypernym of Nemertea; that is, phylum is a word with a broader meaning than Nemertea:

Nemertea: proboscis worms
phylum: (biology) the major taxonomic group of animals and plants; contains classes

Nemertea (noun)	phylum (noun)
proboscis worms	(biology) the major taxonomic group of animals and plants; contains classes
	(linguistics) a large group of languages that are historically related