rumination vs emesis

rumination and emesis both are nouns.

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

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

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

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

rumination (noun)	emesis (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 calm, lengthy, intent consideration