Annelida vs phylum

Annelida and phylum both are nouns.

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

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

Annelida: segmented worms: earthworms, lugworms, leeches
phylum: (biology) the major taxonomic group of animals and plants; contains classes

Annelida (noun)	phylum (noun)
segmented worms: earthworms, lugworms, leeches	(biology) the major taxonomic group of animals and plants; contains classes
	(linguistics) a large group of languages that are historically related