vomitus vs excrement

vomitus and excrement both are nouns.

Word	Noun	Adjective	Verb	Adverb
vomitus	Yes	No	No	No
excrement	Yes	No	No	No

As nouns, excrement is a hypernym of vomitus; that is, excrement is a word with a broader meaning than vomitus:

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

Other hypernyms of vomitus include body waste, excreta, excretion, excretory product.

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