Keep a Word, Delete a Word

egg shells

egg custard

Custard pie

pie hole

Swimming hole

swimming pool

Pool shark

whale shark

white whale

white water

White House

water clock

given the close timing of the last two posts, I have to go with:
Clock House

Goggle it; it’s valid usage

house red

Red Lobster

Lobster Quadrille

“Rock Lobster”

Plymouth Rock

Plymouth, England

England Dan