An idea is a conscious thought you may have about something.

A rough or course material is called roughage.

The sound someone makes while breathing with difficulty.

When something is very stimulating or exciting, it is said to be provocative.

To brighten up an area is to illuminate it.

When someone performs a favour for you, then you are obliged to return the gesture.

A distinctive looking rod or pole to identify a set boundary is called a stake.

Describing something that can be hazardous is called perilous.

An irrational belief about something or someone is called superstition.

The area between your knees and the ankle is called your shin.