gulp vs reflex

gulp and reflex both are nouns.

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

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

gulp (noun)	reflex (noun)
a large and hurried swallow	an automatic instinctive unlearned reaction to a stimulus
a spasmodic reflex of the throat made as if in swallowing

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

gulp (verb)	reflex (verb)
utter or make a noise, as when swallowing too quickly
to swallow hurriedly or greedily or in one draught