Epistoler is a 9 letter English word. It's valid Words with friends word worth 13 points.
You can make 679 anagrams from letters in epistoler (eeiloprst).
1520-30; Latin epistol(a) epistle + -er1
Howell, the epistoler, admitted her (in rather execrable verse) to that Tenth Museship which has had so many fair incumbents.
Perhaps there is, at any rate in the earlier letters, something of this unkemptness in Keats as an epistoler.