ZOOSTEROLS

Z10 - O1 - O1 - S1 - T1 - E1 - R1 - O1 - L1 - S1 has 19 points in Scrabble!

Z10 - O1 - O1 - S1 - T1 - E1 - R1 - O1 - L2 - S1 has 20 points in Words with Friends!

Found in the OTCWL2014, SOWPODS, ENABLE, and WWF dictionaries