She had a pair of nigger knockers hanging on her front door.

He used a nigger knocker to knock on the door.

I love the unique designs of door knockers on old houses.

The knocker ups used to wake people up in the morning.

The knocker-ups used to wake people up in the morning.

The knockers up were responsible for waking people up in the morning.

Knocker-uppers were people who used long sticks to tap on windows to wake up workers in the morning.

The wrestling match was full of slobber knockers.

The tin knockers are working on the roof of the building.

The pork knockers are searching for gold in the river.