BIP39 stands for Bitcoin Improvement Proposal 39. The words are picked from a particular list of 2048 popular English words which can be used to the make a binary seed (your private important). You should be able to examine if the final word of the seed from the video previously https://letusbookmark.com/story20589056/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator