canniest

canniest is a valid word in Scrabble and Words With Friends. It has 8 letters and scores 10 points before any board bonuses (c 3 + a 1 + n 1 + n 1 + i 1 + e 1 + s 1 + t 1).

It is an anagram of 2 other words: instance, ancients.

“CANNIEST” on Wiktionary