BM vs droppings

BM and droppings both are nouns.

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

As nouns, droppings is a hyponym of BM; that is, droppings is a word with a more specific, narrower meaning than BM:

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

BM (noun)	droppings (noun)
solid excretory product evacuated from the bowels	fecal matter of animals