phylum vs taxonomic category

phylum and taxonomic category both are nouns.

Word	Noun	Adjective	Verb	Adverb
phylum	Yes	No	No	No
taxonomic category	Yes	No	No	No

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

phylum: (biology) the major taxonomic group of animals and plants; contains classes
taxonomic category: animal or plant group having natural relations

Other hypernyms of phylum include taxon, taxonomic group.

phylum (noun)	taxonomic category (noun)
(biology) the major taxonomic group of animals and plants; contains classes	animal or plant group having natural relations
(linguistics) a large group of languages that are historically related