Yes, earth is a Scrabble word!

Verb

1. Hide in the earth like a hunted animal

2. Connect to the earth

Noun

1. The 3rd planet from the sun; the planet we live on

2. The loose soft material that makes up a large part of the land surface

3. The solid part of the earth's surface

4. The abode of mortals (as contrasted with Heaven or Hell)

5. Once thought to be one of four elements composing the universe (Empedocles)

6. The concerns of this life as distinguished from heaven and the afterlife

7. A connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage)