feces vs poop

feces and poop both are nouns.

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

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

feces (noun)	poop (noun)
solid excretory product evacuated from the bowels	the rear part of a ship
	slang terms for inside information
	a stupid foolish person
	obscene terms for feces