gulp vs inborn reflex

gulp and inborn reflex both are nouns.

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

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

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