Knockoutter 

Someone who knocks out other people.

Joe kicked butt and knocked out Fish Wasabi, he’s a knockoutter.

Knockoutter by jillybeanapril March 15, 2023

knockbuster 

fake blockbuster, knockoff of a blockbuster movie, copy

holloween 2 is a major knockbuster of its original.

triassic park, throw mormon from the train.

clash of the titans is a failed attempt to renew its 1981 original, hence a knockbuster of a blockbuster.

knockbuster by krablegs May 9, 2010

Knockometer 

Derbysharian slang for 'Hammer'.

"Hammer that nail in with your new knockometer!"

Knockometer by Derbyshire Linguist September 27, 2022

KnockoutTree

A person who is usually a scaredy cat who is afraid of everything but not trees. He kills trees.

Wow, that dude is a KnockoutTree when it comes to trees.

KnockoutTree by Cloud boy May 19, 2016