barf vs body waste

barf and body waste both are nouns.

Word	Noun	Adjective	Verb	Adverb
barf	Yes	No	Yes	No
body waste	Yes	No	No	No

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

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

Other hypernyms of barf include excrement, excreta, excretion, excretory product.

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

barf (verb)	body waste (verb)
eject the contents of the stomach through the mouth