Rotifera vs phylum

Rotifera and phylum both are nouns.

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

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

Rotifera: a phylum including: rotifers
phylum: (biology) the major taxonomic group of animals and plants; contains classes

Rotifera (noun)	phylum (noun)
a phylum including: rotifers	(biology) the major taxonomic group of animals and plants; contains classes
	(linguistics) a large group of languages that are historically related