Yes, polish is a Scrabble word!

Verb

1. Make (a surface) shine

2. Improve or perfect by pruning or polishing

3. Bring to a highly developed, finished, or refined state

Adjective

1. Of or relating to Poland or its people or culture

Noun

1. The property of being smooth and shiny

2. A highly developed state of perfection; having a flawless or impeccable quality

3. A preparation used in polishing

4. The Slavic language of Poland