dejection vs dog shit

dejection and dog shit both are nouns.

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

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

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

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