Is “Thunder” a Scrabble word?

1.The loud rumbling, cracking, or crashing sound caused by expansion of rapidly heated air around a lightning bolt.

“Thunder is preceded by lightning.”

2.A deep, rumbling noise resembling thunder.

“Off in the distance, he heard the thunder of hoofbeats, signalling a stampede.”

3.An alarming or startling threat or denunciation.

1.To produce thunder; to sound, rattle, or roar, as a discharge of atmospheric electricity; often used impersonally.

“It thundered continuously.”

2.To make a noise like thunder.

“The train thundered along the tracks.”

3.To talk with a loud, threatening voice.