Yes, sin is a Scrabble word!

Verb

1. Commit a sin; violate a law of God or a moral law

2. Commit a faux pas or a fault or make a serious mistake

Noun

1. Estrangement from god

2. An act that is regarded by theologians as a transgression of God's will

3. Ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle

4. (Akkadian) god of the Moon; counterpart of Sumerian Nanna

5. The 21st letter of the Hebrew alphabet

6. Violent and excited activity