phylum vs taxonomic group

phylum and taxonomic group both are nouns.

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

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

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

Other hypernyms of phylum include taxon, taxonomic category.

phylum (noun)	taxonomic group (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