Yes, jinx is a Scrabble word!
...and is worth 18 points in Scrabble, and 21 points in Words with Friends
jinx
Verb
1. Cast a spell over someone or something; put a hex on someone or something
2. Foredoom to failure
Noun
1. A person believed to bring bad luck to those around him
2. An evil spell
What Scrabble words can I make with the letters in jinx?
3 Letter Words
2 Letter Words