shivering vs unsteady

shivering is a noun but unsteady is not a noun.

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

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

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