eructation vs inborn reflex

eructation and inborn reflex both are nouns.

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

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

eructation: a reflex that expels gas noisily from the stomach through the mouth
inborn reflex: an automatic instinctive unlearned reaction to a stimulus

eructation (noun)	inborn reflex (noun)
a reflex that expels gas noisily from the stomach through the mouth	an automatic instinctive unlearned reaction to a stimulus
(of volcanoes) pouring out fumes or lava (or a deposit so formed)