Yes, abaca is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
abaca
Noun
1. A kind of hemp obtained from the abaca plant in the Philippines
2. Philippine banana tree having leafstalks that yield Manila hemp used for rope and paper etc
What Scrabble words can I make with the letters in abaca?
3 Letter Words
2 Letter Words