BIP39 means Bitcoin Enhancement Proposal 39. The words are picked from a particular list of 2048 common English words which may be used to the generate a binary seed (your personal key). BIP39 and forty four, Conversely, can be a Newer method of standardization of a selected list of words https://thebookmarkid.com/story19697984/bip39-seed-phrase-mnemonics-generator-an-overview