For words that have only 3 letters, there isn't any 4th letter. Such as with the word “increase”, there aren't any far more letters afterwards and thus needs to be the word "incorporate". The word “addict” is in the BIP39 wordlist however, you would have used “addi” for “addict”. Getting https://bookmarkbooth.com/story18868606/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting