Sayest is a 6 letter English word. It's valid Scrabble word worth 9 points. It's valid Words with friends word worth 8 points.
You can make 90 anagrams from letters in sayest (aessty).
And what sayest thou to the effect which the words produced upon me?
Yea, but sayest thou, I must not expect a Plato's commonwealth.
The question of the scribes and Pharisees, "But what sayest thou?"
Then after a little pause, “And what sayest thou to Lettice—my little Lettice?”
What sayest thou: let's take one of these unwieldy vessels and away to the North?
sayest thou this thing of thyself, or did others tell it thee of Me?
But, Launce, how sayest thou, that my master is become a notable lover?
At last her husband said slowly, “What sayest thou, Isoult?”
Their Missals have become incredible, a sheer platitude, sayest thou?
What sayest thou, art thou guilty of this indictment, or not?