person vs human body

person and human body both are nouns.

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

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

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

person (noun)	human body (noun)
a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential	alternative names for the body of a human being
a human body (usually including the clothing)
a grammatical category used in the classification of pronouns, possessive determiners, and verb forms according to whether they indicate the speaker, the addressee, or a third party