subspecies vs taxonomic group

subspecies and taxonomic group both are nouns.

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

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

subspecies: (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species
taxonomic group: animal or plant group having natural relations

Other hypernyms of subspecies include taxon, taxonomic category.

subspecies (noun)	taxonomic group (noun)
(biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species	animal or plant group having natural relations