human body vs chassis

human body and chassis both are nouns.

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

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

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

human body (noun)	chassis (noun)
alternative names for the body of a human being	the skeleton of a motor vehicle consisting of a steel frame supported on springs that holds the body and motor
	a metal mounting for the circuit components of an electronic device
	alternative names for the body of a human being