Example : His carelessness could have caused an ecological upset.
She was unprepared for this sudden overthrow of their normal way of living.

Synonyms : derangement, upset

Example : The Czar was overthrown.
Subvert the ruling class.

Synonyms : bring down, overturn, subvert

Example : The Republicans were overruled when the House voted on the bill.

Synonyms : override, overrule, overturn, reverse