Suddenly realized one of my seed phrase words does not appear on the BIP39 list.

I have memorized my seed phrase by heart for 4 years to the point i sing it to myself in my head when I brush my teeth.

Then, thanks to this sub, I learned about the BIP 39 word list.

To my disgust, I suddenly realized that one of the words in my seed phrase does not even appear on the BIP 39 word list, making the entire seed phrase worthless!

Panic ensued, because it effectively means access to my entire bitcoin stack depends upon the continuted functionality of my 4 years old Ledger Nano S!

I don't know how this could have happened. I must have misspelled it when I wrote it down and memorized it wrong?

Anyway, I had to move my all of my crypto to an exchange, reset my Ledger, generate a new seed phrase + address, and move the bitcoin back. At least now I did a recovery check and know that the seed phrase 100% works.