Those terms are not part of the AppleScript language itself, so you aren’t going to find them in the AppleScript Language Guide (although they are available from the System Events processes suite). You can use something like the Accessibility Inspector application (included with Xcode) to find which terms are used for any given UI element - the terms themselves are defined in macros or constants in the various Cocoa frameworks, such as Application Services.
Topic:
App & System Services
SubTopic:
Automation & Scripting
Tags: