Yes, curve is a Scrabble word!

Verb

1. Turn sharply; change direction abruptly

2. Extend in curves and turns

3. Form an arch or curve

4. Bend or cause to bend

5. Form a curl, curve, or kink

Noun

1. The trace of a point whose direction of motion changes

2. A line on a graph representing data

3. A pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter

4. The property possessed by the curving of a line or surface

5. Curved segment (of a road or river or railroad track etc.)