ZEPTOSECOND

- One sextillionth (10-21) of a second.

Z10 - E1 - P3 - T1 - O1 - S1 - E1 - C3 - O1 - N1 - D2 has 25 points in Scrabble!

Z10 - E1 - P4 - T1 - O1 - S1 - E1 - C4 - O1 - N2 - D2 has 28 points in Words with Friends!

Found in the OTCWL2014 and SOWPODS dictionaries