According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 15 words with the pattern -O-NER.
That is, six letter words with 2nd letter O and 4th letter N and
5th letter E and 6th letter R. In alphabetical order, they are:
booner
coiner
conner
corner
downer
horner
joiner
loaner
moaner
mooner
nooner
sooner
sorner
tonner
wonner