Yes, splitting is a Scrabble word!

Adjective

1. Resembling a sound of violent tearing as of something ripped apart or lightning splitting a tree

Verb

1. Separate into parts or portions

2. Separate or cut with a tool, such as a sharp instrument

3. Discontinue an association or relation; go different ways

4. Go one's own way; move apart

5. Come open suddenly and violently, as if from internal pressure