feces vs faecal matter

feces and faecal matter both are nouns.

Word	Noun	Adjective	Verb	Adverb
feces	Yes	No	No	No
faecal matter	Yes	No	No	No

As nouns, feces and faecal matter are synonyms defined as:

feces and faecal matter: solid excretory product evacuated from the bowels

Other synonyms of feces include BM, dejection, faeces, fecal matter, ordure, stool.

feces (noun)	faecal matter (noun)
solid excretory product evacuated from the bowels	solid excretory product evacuated from the bowels