BM vs faeces

BM and faeces both are nouns.

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

As nouns, BM and faeces are synonyms defined as:

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

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