Tunicata vs phylum

Tunicata and phylum both are nouns.

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

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

Tunicata: tunicates
phylum: (biology) the major taxonomic group of animals and plants; contains classes

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