taxon vs taxonomic category

taxon and taxonomic category both are nouns.

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

As nouns, taxon and taxonomic category are synonyms defined as:

taxon and taxonomic category: animal or plant group having natural relations

Other synonyms of taxon include taxonomic group.

taxon (noun)	taxonomic category (noun)
animal or plant group having natural relations	animal or plant group having natural relations