gulp vs reflex response

gulp and reflex response both are nouns.

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

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

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