mydriasis vs instinctive reflex

mydriasis and instinctive reflex both are nouns.

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

As nouns, instinctive reflex is a hypernym of mydriasis; that is, instinctive reflex 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
instinctive reflex: an automatic instinctive unlearned reaction to a stimulus

mydriasis (noun)	instinctive reflex (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