adult body vs human body

adult body and human body both are nouns.

Word	Noun	Adjective	Verb	Adverb
adult body	Yes	No	No	No
human body	Yes	No	No	No

As nouns, human body is a hypernym of adult body; that is, human body is a word with a broader meaning than adult body:

Other hypernyms of adult body include anatomy, bod, build, chassis, figure, flesh, form, frame, material body, physical body, physique, shape, soma.

adult body (noun)	human body (noun)
the body of an adult human being	alternative names for the body of a human being