vomit vs hyperemesis

vomit and hyperemesis both are nouns.

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

As nouns, hyperemesis is a hyponym of vomit; that is, hyperemesis 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
hyperemesis: severe and excessive vomiting

Other hyponyms of vomit include rumination, haematemesis, hematemesis.

vomit (noun)	hyperemesis (noun)
the reflex act of ejecting the contents of the stomach through the mouth	severe and excessive vomiting
a medicine that induces nausea and vomiting
the matter ejected in vomiting

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