thwack /thwak/

To whack, strike loudly, esp with something flat

A loud whack

thwackˈer noun

• efface
• effaceable
• effaced
• effacement
• effacements
• efface oneself
• effacer
• effacers
• effaces
• effacing
• effect
• effected
• effecter
• effecters
• effectible
• effecting
• effective
• effectively
• effectiveness
• effectivenesses
• effective rate
• effective rates
• effectives
• effectivity
• effectless