dejection vs dog do

dejection and dog do both are nouns.

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

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

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

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