chassis vs organic structure

chassis and organic structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
chassis	Yes	No	No	No
organic structure	Yes	No	No	No

As nouns, organic structure is a hypernym of chassis; that is, organic structure is a word with a broader meaning than chassis:

chassis: alternative names for the body of a human being
organic structure: the entire physical structure of an organism (an animal, plant, or human being)

Other hypernyms of chassis include body.

chassis (noun)	organic structure (noun)
the skeleton of a motor vehicle consisting of a steel frame supported on springs that holds the body and motor	the entire physical structure of an organism (an animal, plant, or human being)
a metal mounting for the circuit components of an electronic device
alternative names for the body of a human being