phylum vs taxon

phylum and taxon both are nouns.

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

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

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

Other hypernyms of phylum include taxonomic category, taxonomic group.

phylum (noun)	taxon (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