anatomy vs male body

anatomy and male body both are nouns.

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

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

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

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