Yes, lineal is a Scrabble word!
...and is worth 6 points in Scrabble, and 9 points in Words with Friends
lineal
Adjective
1. In a straight unbroken line of descent from parent to child
2. Arranged in a line
What Scrabble words can I make with the letters in lineal?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words