vomit vs excretion

vomit and excretion both are nouns.

Word	Noun	Adjective	Verb	Adverb
vomit	Yes	No	Yes	No
excretion	Yes	No	No	No

As nouns, excretion is a hypernym of vomit; that is, excretion is a word with a broader meaning than vomit:

vomit: the matter ejected in vomiting
excretion: waste matter (as urine or sweat but especially feces) discharged from the body

Other hypernyms of vomit include body waste, excrement, excreta, excretory product.

vomit (noun)	excretion (noun)
the reflex act of ejecting the contents of the stomach through the mouth	the bodily process of discharging waste matter
a medicine that induces nausea and vomiting	waste matter (as urine or sweat but especially feces) discharged from the body
the matter ejected in vomiting

vomit (verb)	excretion (verb)
eject the contents of the stomach through the mouth