reflex vs reflex action

reflex and reflex action both are nouns.

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

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

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

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

reflex (adjective)	reflex action (adjective)
without volition or conscious control