superphylum vs taxonomic group

superphylum and taxonomic group both are nouns.

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

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

superphylum: (biology) a taxonomic group ranking between a phylum and below a class or subclass
taxonomic group: animal or plant group having natural relations

Other hypernyms of superphylum include taxon, taxonomic category.

superphylum (noun)	taxonomic group (noun)
(biology) a taxonomic group ranking between a phylum and below a class or subclass	animal or plant group having natural relations