unconditioned reflex vs physiological reaction

unconditioned reflex and physiological reaction both are nouns.

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

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

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

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

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