human body vs person

human body and person both are nouns.

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

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

Other hyponyms of human body include juvenile body, adult body, male body, female body.

human body (noun)	person (noun)
alternative names for the body of a human being	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential
	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