password
Synonym discussion
Sense: noun/1
For noun sense 1, password is the general everyday word for secret information that lets you enter a system, device, account, or protected place. Passcode is close, but it often suggests numbers, especially on phones, doors, or lockers. PIN is narrower still: it is a short personal identification number used at cash machines, card readers, or secure doors. Passphrase usually means a longer group of words and is common in security advice. Code is the loosest option and can describe many kinds of secret number or signal, not only login information. You enter a password for email, a PIN at an ATM, and a passcode to unlock a phone.
Common collocations
Etymology
Password is an English compound of pass and word. It first meant a secret spoken word that let someone go past a guard, and later widened to the secret code used for computers, phones, and online accounts.