reflex action vs reflex

reflex action and reflex both are nouns.

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

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

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

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

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