If I might make a suggestion about the Structured Keywords panel:
Create your hierarchical keyword list in a text editor -- Microsoft Word is fine, for example. Use the Tabs to create the hierarchy, and use commas to create synonyms, like so:
sports
football
soccer
basketball,hoops
hockey
ice hockey
field hockey
Save this file as a text document, and use the Load button in the Structured Keywords panel to import it. (NOTE: THIS WILL WIPE OUT ANYTHING YOU'VE DONE INSIDE THE PANEL.) If you need to make any changes to your Keywords, just open the text document, make those changes, and re-Load it.
It's a lot easier to make wholesale changes in your keywords this way.
--Ken