Yes, curse is a Scrabble word!

Verb

1. Utter obscenities or profanities

2. Heap obscenities upon

3. Wish harm upon; invoke evil upon

4. Exclude from a church or a religious community

Noun

1. Profane or obscene expression usually of surprise or anger

2. An appeal to some supernatural power to inflict evil on someone or some group

3. An evil spell

4. Something causing misery or death

5. A severe affliction