Hello Shana
I have not seen the word "instable" being used often. The word "instability" exists, though.Instability is just the noun form of unstable.
On the other hand, unstable means when someone or something is likely to change suddenly.
In relation to destabilizing and destabilized, the word destabilize without the (d) is a verb which means to make a system, country, government etc become unstable, face unrest or less successful while destabilizing is an adjective which means upsetting the stability of a region or system; causing unrest.
In relation to your sentence, l think it is not very clear to me. So do well and send me a complete sentence so l can help you but in return, l have some suggestions:
- uncertainties and instability may destabilize the system…
- uncertainties destabilized the economy…
N.B It is better to say [what is the difference]or [what are the differences] rather that saying [what are the difference]
Also, [can l replace] since the action is still to be executed.
Best regards 😊