body vs backside

body and backside both are nouns.

Word	Noun	Adjective	Verb	Adverb
body	Yes	No	Yes	No
backside	Yes	No	No	No

body (noun)	backside (noun)
the external structure of a vehicle	the fleshy part of the human body that you sit on
a resonating chamber in a musical instrument (as the body of a violin)	the side of an object that is opposite its front
the property of holding together and retaining its shape
the main mass of a thing
the entire physical structure of an organism (an animal, plant, or human being)
the body excluding the head and neck and limbs
a natural object consisting of a dead animal or person
the central message of a communication
a group of persons associated by some common tie or occupation and regarded as an entity
a collection of particulars considered as a system
an individual 3-dimensional object that has mass and that is distinguishable from other objects

body (verb)	backside (verb)
invest with or as with a body; give body to