Nit: It's useful to distinguish between passwords (checked against a hash for auth) and passphrases (used for decryption). It's an important practical distinction because a lost password can in general be bypassed out-of-band somehow while a backup strategy for passphrases is essential.
A more common definition of passphrase is a a password which is a phrase which makes it longer but also more predictable in it's structure.
Similar prompts for decryption will ask you for passwords in most cases as non technical users shouldn't need to understand the underlying technical differences (nor do they normally want to, or do).
Nit: It's useful to distinguish between passwords (checked against a hash for auth) and passphrases (used for decryption). It's an important practical distinction because a lost password can in general be bypassed out-of-band somehow while a backup strategy for passphrases is essential.