Open English Wordnet
Nouns
(n)upset, derangement, overthrowthe act of disturbing the mind or body“his carelessness could have caused an ecological upset”, “she was unprepared for this sudden overthrow of their normal way of living”
Verbs
(v)overthrow, subvert, overturn, bring downcause the downfall of; of rulers“The Czar was overthrown”, “subvert the ruling class”