Nouns

(n)upset, overturn, turnoverthe act of upsetting something“he was badly bruised by the upset of his sled at a high speed”
(n)overturn, upsetan improbable and unexpected victory“the biggest upset since David beat Goliath”

Verbs

(v)overturn, turn over, tip over, tump overturn from an upright or normal position“The big vase overturned”, “The canoe tumped over”
(v)overturn, tip over, turn over, upset, knock over, bowl over, tump overcause to overturn from an upright or normal position“The cat knocked over the flower vase”, “the clumsy customer turned over the vase”, “he tumped over his beer”
(v)overrule, overturn, override, overthrow, reverserule against“The Republicans were overruled when the House voted on the bill”
(v)overthrow, subvert, overturn, bring downcause the downfall of; of rulers“The Czar was overthrown”, “subvert the ruling class”
(v)revoke, annul, lift, countermand, reverse, repeal, overturn, rescind, vacatecancel officially“He revoked the ban on smoking”, “lift an embargo”, “vacate a death sentence”
(v)revolutionize, revolutionise, overturnchange radically“E-mail revolutionized communication in academe”