By right clicking (Control-click on a single button mouse) on any word/phrase in the word list, you will be presented with a contexual menu. At the bottom of that menu you can select "Check Spelling". This will check the spelling on the word/ phrase you selected in the word list. If the word is spelled correctly, a notice will be displayed briefly under the font size.
If the word/ phrase is not spelled correctly, you will be presented with a dialog sheet giving you your options.