Yes, speed is a Scrabble word!

Verb

1. Move fast

2. Move faster

3. Move very fast

4. Travel at an excessive or illegal velocity

5. Cause to move faster

Noun

1. Distance travelled per unit time

2. A rate (usually rapid) at which something happens

3. Changing location rapidly

4. The ratio of the focal length to the diameter of a (camera) lens system

5. A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression