Yes, spark is a Scrabble word!

Verb

1. Put in motion or move to act

2. Emit or produce sparks

Noun

1. A momentary flash of light

2. Merriment expressed by a brightness or gleam or animation of countenance

3. Electrical conduction through a gas in an applied electric field

4. A small but noticeable trace of some quality that might become stronger

5. Scottish writer of satirical novels (born in 1918)

6. A small fragment of a burning substance thrown out by burning material or by friction