sneezing vs instinctive reflex

sneezing and instinctive reflex both are nouns.

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

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

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

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