The ein anderes Wort widget for wordpress higher than version 2.8 lists a certain amount of synonyms for a search term in the sidebar. The amount can be specified in the admin panel.
A button is added to the visual post editor which can be used to choose a synonym for the currently selected term.
Features
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ajax-based widget with search formular for the sidebar
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the maximum amount of wordgroups to be displayed as and also the maximum amount of words out of each wordgroup to be displayed is adjustable
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plugin for the visual editor for simple replacing terms with synonyms by a mouse click
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multi widget ability which enables adding any desired number of instances of the widget to any number of sidebars