puking vs regurgitation

puking and regurgitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
puking	Yes	No	No	No
regurgitation	Yes	No	No	No

As nouns, puking and regurgitation are synonyms defined as:

puking and regurgitation: the reflex act of ejecting the contents of the stomach through the mouth

Other synonyms of puking include disgorgement, emesis, vomit, vomiting.

puking (noun)	regurgitation (noun)
the reflex act of ejecting the contents of the stomach through the mouth	the reflex act of ejecting the contents of the stomach through the mouth
	recall after rote memorization
	backflow of blood through a defective heart valve