unsteadiness vs movability

unsteadiness and movability both are nouns.

Word	Noun	Adjective	Verb	Adverb
unsteadiness	Yes	No	No	No
movability	Yes	No	No	No

As nouns, movability is a hypernym of unsteadiness; that is, movability is a word with a broader meaning than unsteadiness:

unsteadiness: the quality of not being steady or securely fixed in place
movability: the quality of being movable; capable of being moved or rearranged

Other hypernyms of unsteadiness include movableness.

unsteadiness (noun)	movability (noun)
the quality of not being steady or securely fixed in place	the quality of being movable; capable of being moved or rearranged
the quality of being unsteady--varying and unpredictable