sneeze vs reflex action

sneeze and reflex action both are nouns.

Word	Noun	Adjective	Verb	Adverb
sneeze	Yes	No	Yes	No
reflex action	Yes	No	No	No

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

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

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

sneeze (verb)	reflex action (verb)
exhale spasmodically, as when an irritant entered one's nose