sneezing vs reflex response

sneezing and reflex response both are nouns.

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

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

sneezing: a symptom consisting of the involuntary expulsion of air from the nose
reflex response: an automatic instinctive unlearned reaction to a stimulus

sneezing (noun)	reflex response (noun)
a symptom consisting of the involuntary expulsion of air from the nose	an automatic instinctive unlearned reaction to a stimulus