rear vs poop

rear and poop both are nouns.

Word	Noun	Adjective	Verb	Adverb
rear	Yes	Yes	Yes	No
poop	Yes	No	No	No

As nouns, poop is a hyponym of rear; that is, poop is a word with a more specific, narrower meaning than rear:

Other hyponyms of rear include after part, quarter, stern, tail, empennage, tail, tail assembly.

rear (noun)	poop (noun)
the side that goes last or is not normally seen	the rear part of a ship
the fleshy part of the human body that you sit on	slang terms for inside information
the back of a military formation or procession	a stupid foolish person
the side of an object that is opposite its front	obscene terms for feces
the part of something that is furthest from the normal viewer

rear (adjective)	poop (adjective)
located in or toward the back or rear

rear (verb)	poop (verb)
construct, build, or erect
stand up on the hind legs, of quadrupeds
cause to rise up
look after a child until it is an adult
rise up