Passcode
What is the difference between passwords and passcode?
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In general a passCODE is a 4-6 digit code, for example used to unlock a mobile device after you turn it on, and a passWORD is what is used to log into your Apple ID account. Passcodes are usually numbers but you could have your device set to use an alphanumeric passcode.
This could be more accurately answered if we knew the context in which you are encountering this. Here are some context examples:
If you forgot your iPhone passcode - Apple Support
If you forgot your Apple ID password - Apple Support