physiological reaction vs reflex response

physiological reaction and reflex response both are nouns.

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

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

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

Other synonyms of physiological reaction include inborn reflex, innate reflex, instinctive reflex, reflex, reflex action, unconditioned reflex.

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