Yes, yew is a Scrabble word!
...and is worth 9 points in Scrabble, and 8 points in Words with Friends
yew
Noun
1. Wood of a yew; especially the durable fine-grained light brown or red wood of the English yew valued for cabinetwork and archery bows
2. Any of numerous evergreen trees or shrubs having red cup-shaped berries and flattened needlelike leaves
What Scrabble words can I make with the letters in yew?
3 Letter Words
2 Letter Words