mydriasis vs reflex response

mydriasis and reflex response both are nouns.

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

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

mydriasis: reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
reflex response: an automatic instinctive unlearned reaction to a stimulus

mydriasis (noun)	reflex response (noun)
reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs	an automatic instinctive unlearned reaction to a stimulus