regurgitation vs reflex

regurgitation and reflex both are nouns.

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

As nouns, reflex is a hypernym of regurgitation; that is, reflex is a word with a broader meaning than regurgitation:

regurgitation: the reflex act of ejecting the contents of the stomach through the mouth
reflex: an automatic instinctive unlearned reaction to a stimulus

regurgitation (noun)	reflex (noun)
the reflex act of ejecting the contents of the stomach through the mouth	an automatic instinctive unlearned reaction to a stimulus
recall after rote memorization
backflow of blood through a defective heart valve

regurgitation (adjective)	reflex (adjective)
	without volition or conscious control