fecal matter vs shit

fecal matter and shit both are nouns.

Word	Noun	Adjective	Verb	Adverb
fecal matter	Yes	No	No	No
shit	Yes	No	Yes	No

As nouns, shit is a hyponym of fecal matter; that is, shit is a word with a more specific, narrower meaning than fecal matter:

Other hyponyms of fecal matter include dog do, dog shit, dog turd, doggy do, crap, dirt, poop, shite, turd, droppings, dung, muck, meconium, melaena, melena.

fecal matter (noun)	shit (noun)
solid excretory product evacuated from the bowels	something of little value
	Obscene word for unacceptable behavior
	insulting terms of address for people who are stupid or irritating or ridiculous
	a coarse term for defecation
	a small worthless amount
	obscene terms for feces

fecal matter (verb)	shit (verb)
	have a bowel movement
	give away information about somebody