anatomy vs adult body

anatomy and adult body both are nouns.

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

As nouns, adult body is a hyponym of anatomy; that is, adult body is a word with a more specific, narrower meaning than anatomy:

Other hyponyms of anatomy include person, juvenile body, male body, female body.

anatomy (noun)	adult body (noun)
a detailed analysis	the body of an adult human being
alternative names for the body of a human being
the branch of morphology that deals with the structure of animals