You'd like to save a Vocabulary Set in Clicker Communicator for iPad.
To ensure you have the latest Clicker Communicator, please check for updates:
https://support.apple.com/HT202180
When you create a new Vocabulary Set, it's stored in the Communicator folder on your iPad.
Any changes you make are saved automatically, so you don't need to worry about saving!
You can manage your Vocabulary Sets using the Apple Files app: