subkingdom vs taxonomic group

subkingdom and taxonomic group both are nouns.

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

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

subkingdom: (biology) a taxonomic group comprising a major division of a kingdom
taxonomic group: animal or plant group having natural relations

Other hypernyms of subkingdom include taxon, taxonomic category.

subkingdom (noun)	taxonomic group (noun)
(biology) a taxonomic group comprising a major division of a kingdom	animal or plant group having natural relations