dejection vs doggy do

dejection and doggy do both are nouns.

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

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

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

dejection (noun)	doggy do (noun)
a state of melancholy depression	fecal droppings from a dog
solid excretory product evacuated from the bowels