Yes, ether is a Scrabble word!

Noun

1. The fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

2. Any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom

3. A medium that was once supposed to fill all space and to support the propagation of electromagnetic waves

4. A colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic