reflex response vs physiological reaction

reflex response and physiological reaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
reflex response	Yes	No	No	No
physiological reaction	Yes	No	No	No

As nouns, reflex response and physiological reaction are synonyms defined as:

reflex response and physiological reaction: an automatic instinctive unlearned reaction to a stimulus

reflex response (noun)	physiological reaction (noun)
an automatic instinctive unlearned reaction to a stimulus	an automatic instinctive unlearned reaction to a stimulus