Bip39 Word List. We use facts gathered through cookies and related systems to improve your expertise on our website, analyse how you use it and for marketing uses. For words that only have 3 letters, there is absolutely no 4th letter. By way of example With all the word “increase”, https://phrasedirectory.com/listings13031278/bip39-mnemonic-code-converter-tool-https-linktr-ee-bip39-bip39-options