As of right now there are 11 narratively important passwords. Any others either are Easter eggs or aren't passwords.
**SPOILER**
There’s 11?? Geez, I must not be paying enough attention...I’ve only gotten the route specific ones, Benson’s saving and bad end, and Day 10’s password...There’s a word in the list that asks for a different day, but no matter what day I try, it keeps asking me for the specific day, leading me to believe I’m either doing something wrong or it’s for a future update... so I’m left with a password that’s supposedly usable and another I apparently haven’t found yet..............¿?is this normal?¿
If you've gotten to a point where everyone is alive, you're doing fine. Just because it's narratively important, doesn't mean it necessarily is there to circumvent a death specifically.
Alternatively, some scenarios could potentially have multiple passwords to get you through the same event just in different ways.