meconium vs dejection

meconium and dejection both are nouns.

Word	Noun	Adjective	Verb	Adverb
meconium	Yes	No	No	No
dejection	Yes	No	No	No

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

meconium: thick dark green mucoid material that is the first feces of a newborn child
dejection: solid excretory product evacuated from the bowels

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

meconium (noun)	dejection (noun)
thick dark green mucoid material that is the first feces of a newborn child	a state of melancholy depression
	solid excretory product evacuated from the bowels