The incorrectly spelled word is rockiry. The correct spelling is rockery.

Here is a breakdown of the spelling of each word:

• Rogue is spelled correctly. It means a dishonest or unscrupulous person.
• Rocket is spelled correctly. It is a device that propels itself through the air by the reaction of gases produced by the combustion of fuel.
• Rockery is a garden of rocks and plants.
• Roaster is a device used to cook food by dry heat, typically over an open fire.