According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 10 words with the pattern S-R-ER.
That is, six letter words with 1st letter S and 3rd letter R and
5th letter E and 6th letter R. In alphabetical order, they are:
scryer
serger
server
skryer
sorner
sorter
sprier
spryer
surfer
surger