You can show the synonyms of a selected word by right-clicking on a word and selecting the Synonyms...
option in the context menu. Then, you can replace the selected word with one of its synonyms selected
in the Synonyms Dialog Box.

All you need to do is to simply set the ShowSynonyms property of the UltimateSpell property of your
UltimateEditor control to true. You can also use the MaxSynonyms property to set the maximum number
of synonyms to show.

Synonyms... option is not available in the SpellAsYouType context menu, therefore, you will need to
correct the word first to see this option in the context menu.

Supports .NET 2.0+.