Yes, joiner is a Scrabble word!
...and is worth 13 points in Scrabble, and 16 points in Words with Friends
joiner
Noun
1. A person who likes to join groups
2. A woodworker whose work involves making things by joining pieces of wood
What Scrabble words can I make with the letters in joiner?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words