The word menu is concerned with managing the dictionaries used for solving puzzles. CrossStar can use as many dictionaries as you want. This lets you have specialist dictionaries. You can choose which dictionaries are used with any given grid file.
Spell check... checks if all the words in the grid are in the dictionaries currently loaded. The point is not so much to spot spelling errors in the grid, but to allow you to find words in the grid that are not in the dictionaries, and update them. This option is only available in crossword mode. It wouldn't make much sense to spell check a wordsquare.
If a missing word is discovered, the spell check window will open.
The text icon at the bottom shows the word which cannot be found in the dictionaries loaded for the current grid. You can click on Continue if you want to do nothing. The main window (titled Guess above) shows guesses at the word. Alternatively when the Browse button is checked the window will let you scroll through the contents of a dictionary. Which dictionary is used can be selected by using the combo control at the top of the window under the text 'Current dictionary' (in the picture above it is showing the name MainDict).
The Add button adds the word in the text icon to the current dictionary - this would be useful if you found a word in a grid that was spelt correctly but which did not appear in your dictionaries.
Load on the words menu leads to a sub menu which displays all the dictionaries available, those ticked are loaded for the current grid. Clicking on the menu can be used to load or unload a dictionary.
Edit leads to a menu of available dictionaries. Clicking on the name of one will open the edit dictionary window on its contents.
Clicking on a word will select it, you can then use the Delete button to delete it from the dictionary. Clicking on the text icon at the bottom of the window will allow you to type in a word. The main dictionary pane will scroll to the closest word in the dictionary to the text typed in. You can add the text in the text icon by clicking on the Add button.
Clicking on OK will close the edit window and update the dictionaries on disc. Cancel can be used to close the window without making any changes to the dictionaries held on disc.
If you click with the right mouse button over the scrolling pane a menu will appear. This offers you the chance to either save the dictionary as a text file, or to load a text file into the dictionary. Text files should consist of one word per line. In addition text files can be dragged and dropped into the scrolling pane.
Create on the words menu opens a window into which you can type the name of a new dictionary. Clicking on OK will create the dictionary.
Delete leads to a menu of available dictionaries. Clicking on the name of one will delete it from disc. Use this feature with care, once a dictionary is deleted it cannot be undeleted.