involuntary vs automatic

involuntary is not a noun while automatic is a noun.

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

involuntary (noun)	automatic (noun)
	self-loading rifle capable of automatic fire
	a pistol that will keep firing until the ammunition is gone or the trigger is released

involuntary (adjective)	automatic (adjective)
not subject to the control of the will	operating with minimal human intervention; independent of external control
controlled by the autonomic nervous system; without conscious control	without volition or conscious control
	resembling the unthinking functioning of a machine