feces vs BM

feces and BM both are nouns.

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

As nouns, feces and BM are synonyms defined as:

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

feces (noun)	BM (noun)
solid excretory product evacuated from the bowels	solid excretory product evacuated from the bowels