immobile vs stiff

immobile is not a noun while stiff is a noun.

Word	Noun	Adjective	Verb	Adverb
immobile	No	Yes	No	No
stiff	Yes	Yes	No	Yes

immobile (noun)	stiff (noun)
	the dead body of a human being
	an ordinary man

immobile (adjective)	stiff (adjective)
not capable of movement or of being moved	having a strong physiological or chemical effect
securely fixed in place	rigidly formal
	not moving or operating freely
	very drunk
	marked by firm determination or resolution; not shakable
	strong, vigorous
	incapable of or resistant to bending

immobile (adverb)	stiff (adverb)
	in a stiff manner
	to a great degree