shit vs fecal matter

shit and fecal matter both are nouns.

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

As nouns, fecal matter is a hypernym of shit; that is, fecal matter is a word with a broader meaning than shit:

Other hypernyms of shit include BM, dejection, faecal matter, faeces, feces, ordure, stool.

shit (noun)	fecal matter (noun)
something of little value	solid excretory product evacuated from the bowels
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

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