BIP39 means Bitcoin Improvement Proposal 39. The words are chosen from a selected list of 2048 popular English words which may be utilized to the make a binary seed (your private key). Finding a person missing word isn’t too challenging. But with many words lacking, it becomes a giant activity. https://directmysocial.com/story3471727/new-step-by-step-map-for-ledger-seed-phrase-bip39