Pyrrophyta vs phylum

Pyrrophyta and phylum both are nouns.

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

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

Pyrrophyta: a division of lower plants comprising unicellular and biflagellate algae that form starchy compounds
phylum: (biology) the major taxonomic group of animals and plants; contains classes

Pyrrophyta (noun)	phylum (noun)
a division of lower plants comprising unicellular and biflagellate algae that form starchy compounds	(biology) the major taxonomic group of animals and plants; contains classes
	(linguistics) a large group of languages that are historically related