ZAPPIEST

- superlative form of zappy: most zappy.

Z10 - A1 - P3 - P3 - I1 - E1 - S1 - T1 has 21 points in Scrabble!

Z10 - A1 - P4 - P4 - I1 - E1 - S1 - T1 has 23 points in Words with Friends!

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