feces vs doggy do

feces and doggy do both are nouns.

Word	Noun	Adjective	Verb	Adverb
feces	Yes	No	No	No
doggy do	Yes	No	No	No

As nouns, doggy do is a hyponym of feces; that is, doggy do is a word with a more specific, narrower meaning than feces:

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

feces (noun)	doggy do (noun)
solid excretory product evacuated from the bowels	fecal droppings from a dog