unsteady vs shivering

unsteady is not a noun while shivering is a noun.

Word	Noun	Adjective	Verb	Adverb
unsteady	No	Yes	No	No
shivering	Yes	Yes	No	No

unsteady (noun)	shivering (noun)
	a sensation of cold that often marks the start of an infection and the development of a fever

unsteady (adjective)	shivering (adjective)
subject to change or variation	vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze
not firmly or solidly positioned