vomit vs rumination

vomit and rumination both are nouns.

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

As nouns, rumination is a hyponym of vomit; that is, rumination is a word with a more specific, narrower meaning than vomit:

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

Other hyponyms of vomit include haematemesis, hematemesis, hyperemesis.

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

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