reflexive vs reflex

reflexive and reflex both are nouns.

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

As adjectives, reflexive and reflex are synonyms defined as:

Other synonyms of reflexive include automatic.

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

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