Select which options will be used by the spelling checker to check the text.
Select how many suggestions to be given when right click on the word that is not in the dictionary.
You may include your own words in the suggestions given by the spelling checker. However, if there are many words in the user dictionary, it may slow down the spelling checker to find suggestions.
This is another method to find suggestions. It may give better suggestions sometimes. It is turned off by default.
Set the number higher in range will return better suggested words but it will take longer time. The default "3" strike a balance between the two.