rumination vs vomit

rumination and vomit both are nouns.

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

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

rumination: regurgitation of small amounts of food; seen in some infants after feeding
vomit: the reflex act of ejecting the contents of the stomach through the mouth

Other hypernyms of rumination include disgorgement, emesis, puking, regurgitation, vomiting.

rumination (noun)	vomit (noun)
regurgitation of small amounts of food; seen in some infants after feeding	the reflex act of ejecting the contents of the stomach through the mouth
(of ruminants) chewing (the cud)	a medicine that induces nausea and vomiting
a calm, lengthy, intent consideration	the matter ejected in vomiting

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