List of all AppleScript commands for Terminal application
In Script Editor you can reference the Dictionary:



Open Script Editor, navigate to File > Open Dictionary...  Choose The Terminal.app 

When you click Terminal Suite you can see a list of classes:



If you wanted to get deeper in AppleScript you could buy the application Script Debugger version 7, but as noted in the comment there is a free version which is Script Debugger Lite if I recall.  It appears to have an extensive library and utilizes a tree structure separation that helps filter through what you might want.  The referenced image is from Script Debugger 6.