barf vs excretion

barf and excretion both are nouns.

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

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

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

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

barf (noun)	excretion (noun)
the matter ejected in vomiting	the bodily process of discharging waste matter
	waste matter (as urine or sweat but especially feces) discharged from the body

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