sternutation vs reflex action

sternutation and reflex action both are nouns.

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

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

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

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