There is no sign of account deletion options, so it seems your data will be theirs for as long as they please (although this is generally not too much: account name and email address). If you feel like requesting deletion or more information, send a message to support@wordfeud.com.
URLS:
http://www.wordfeud.com
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Please delete my Wordfeud account as I wish to use another username
My current username is mika1603 and email is madamklejs@live.dk
Kind regards Anne Sørensen