Yes, acute is a Scrabble word!

Adjective

1. Having or experiencing a rapid onset and short but severe course

2. Extremely sharp or intense

3. Having or demonstrating ability to recognize or draw fine distinctions

4. Of an angle; less than 90 degrees

5. Ending in a sharp point

6. Of critical importance and consequence

Noun

1. A mark (') placed above a vowel to indicate pronunciation