automatic vs reflex

automatic and reflex both are nouns.

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

As adjectives, automatic and reflex are synonyms defined as:

Other synonyms of automatic include reflexive.

automatic (noun)	reflex (noun)
self-loading rifle capable of automatic fire	an automatic instinctive unlearned reaction to a stimulus
a pistol that will keep firing until the ammunition is gone or the trigger is released

automatic (adjective)	reflex (adjective)
operating with minimal human intervention; independent of external control	without volition or conscious control
without volition or conscious control
resembling the unthinking functioning of a machine