The coast is where land meets the sea. Some other words you can use instead of coast are shore and beach.
In stories, a ghost is the spirit of a person who has died. You might dress up like a scary ghost for Halloween.
A lamp post is a post with a light on the top. They are generally outside, so people can see their way around in the dark.
A post is a vertical piece of wood or metal that is used to make something from. Posts are most often used to make fences out of.
Something is roasted if it is cooked for a long time over dry heat, like in an oven or over a fire. Meat and vegetables are both roasted either whole or in large pieces.