whup

As verbs the difference between thrash and whup

is that thrash is to beat mercilessly while whup is alternative form of whoop to whip, thrash, or defeat.

As a noun thrash

is a beat or blow; the sound of beating.

As verbs the difference between whip and whup

is that whip is to hit with a whip while whup is alternative form of whoop to whip, thrash, or defeat.

As a noun whip

is a lash; a pliant, flexible instrument, such as a rod (commonly of cane or rattan) or a plaited or braided rope or thong (commonly of leather) used to create a sharp "crack" sound for directing or herding animals.