IPA: //ʌpˈhiːvəl//
KK: /ʌpˈhiːvəl/
A sudden and violent change or disturbance, often causing confusion or chaos.
The country experienced a major upheaval after the revolution.
Upheaval is formed from "up" (meaning higher or above) and "heave" (from Old English "hefan", meaning to lift or raise). The word describes a lifting or raising up, often in a disruptive or chaotic manner.
Think of something being 'lifted up' ('up') in a way that causes disturbance or chaos, which is what upheaval means.
No commonly confused words.