dog shit vs dejection

dog shit and dejection both are nouns.

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

As nouns, dejection is a hypernym of dog shit; that is, dejection is a word with a broader meaning than dog shit:

Other hypernyms of dog shit include BM, faecal matter, faeces, fecal matter, feces, ordure, stool.

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