anatomy vs human body

anatomy and human body both are nouns.

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

As nouns, anatomy and human body are synonyms defined as:

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

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