whack

nouns

the sound made by a sharp swift blow
whack
is a type of (narrower)
the sudden occurrence of an audible event
"the sound awakened them"
sound
the act of hitting vigorously
"he gave the table a whack"
belt, knock, rap, whack, whang

verbs

hit hard
"The teacher whacked the boy"
wallop, whack, wham, whop
is derived from
whacking