Yes, kiss is a Scrabble word!

Verb

1. Touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.

2. Touch lightly or gently

Noun

1. The act of caressing with the lips (or an instance thereof)

2. A cookie made of egg whites and sugar

3. Any of several bite-sized candies

4. A light glancing touch