reflex vs reflexive

reflex and reflexive both are nouns.

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

As adjectives, reflex and reflexive are synonyms defined as:

Other synonyms of reflex include automatic.

reflex (noun)	reflexive (noun)
an automatic instinctive unlearned reaction to a stimulus	a personal pronoun compounded with -self to show the agent's action affects the agent

reflex (adjective)	reflexive (adjective)
without volition or conscious control	referring back to itself
	without volition or conscious control