Yes, jilt is a Scrabble word!
...and is worth 11 points in Scrabble, and 14 points in Words with Friends
jilt
Verb
1. Cast aside capriciously or unfeelingly
Noun
1. A woman who jilts a lover
What Scrabble words can I make with the letters in jilt?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to jilt:
S:jilts