eructation vs reflex

eructation and reflex both are nouns.

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

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

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

eructation (noun)	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)

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