filter
filler
Feller
One who fells, as in the old joke about the three unskilled workers who answered the call, “Tree fellers wanted”.
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felter
“To clot or mat together like felt”
Fetter
(often plural) a chain or bond fastened round the ankle; shackle
fester
festers has gone, btw (you played it yourself). So has feste and festes, which were in the same chain.
Also rester and tester, and pester, as well as faster.
We haven’t played foster yet, though, only fosters.
ester
chemistry
Any of a class of compounds produced by reaction between acids and alcohols with the elimination of water.
eater
Wiktionary helpfully supplies quotes about cunnilingus.
Ice cream tastes good to the eater, and has the added advantage of providing a little chill of excitement
No! That’s how you get ants!
neater
nearer
bearer
like this 
, but more
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hearer
healer
heater
theater (I wonder what is the required edit distance to reverse the last two letters)
Cheater
My search has lost “in this post” option
Chester
A surname, and the name of many American towns.
In England, ours are called Chesterton (Chester Town), which is also a surname.
I’m reminded of how the attempt at English in the URLs of Taiwanese professional player profiles uses chesser to mean “Go player”.
Hester
As a given name, Hester is a variant of Esther
hetter (hoods, Norwegian)
