phylum Brachiopoda vs phylum

phylum Brachiopoda and phylum both are nouns.

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

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

phylum Brachiopoda: marine invertebrates that resemble mollusks
phylum: (biology) the major taxonomic group of animals and plants; contains classes

phylum Brachiopoda (noun)	phylum (noun)
marine invertebrates that resemble mollusks	(biology) the major taxonomic group of animals and plants; contains classes
	(linguistics) a large group of languages that are historically related