kingdom Animalia vs animal kingdom

kingdom Animalia and animal kingdom both are nouns.

Word	Noun	Adjective	Verb	Adverb
kingdom Animalia	Yes	No	No	No
animal kingdom	Yes	No	No	No

As nouns, kingdom Animalia and animal kingdom are synonyms defined as:

kingdom Animalia and animal kingdom: taxonomic kingdom comprising all living or extinct animals

Other synonyms of kingdom Animalia include Animalia.

kingdom Animalia (noun)	animal kingdom (noun)
taxonomic kingdom comprising all living or extinct animals	taxonomic kingdom comprising all living or extinct animals