The semantic keyword suggestion tool in Competition Strategy Studio is extremely powerful and can generate 200-700 related keywords from a single base keyword phrase. There are automatically generated whenever you do a keyword lookup and are displayed when you select the semantic view button in the "Data Selector".
The generated keywords will contain synonyms and related keywords that do not even contain the base keywords.
You can also expand the keyword list by doing more lookups on any of the keyword phrases returned after the first lookup. To do this, simply right click on any of the generated keyword phrases and select "Analyze Keyword".
You can right click ih the keyword list for other options (copy to pasteboard, open the keyword in a search engine, etc.).