regurgitation vs inborn reflex

regurgitation and inborn reflex both are nouns.

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

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

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

regurgitation (noun)	inborn 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