unconditioned reflex vs reflex action

unconditioned reflex and reflex action both are nouns.

Word	Noun	Adjective	Verb	Adverb
unconditioned reflex	Yes	No	No	No
reflex action	Yes	No	No	No

As nouns, unconditioned reflex and reflex action are synonyms defined as:

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

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