Bip39 To Private Key Wallet software that implement BIP39 only use 2048 iterations being a norm. Growing this parameter will raise protection from brute force attack, but you will have to shop this new parameter. These words are taken from a particular list of 2048 words. The word list is https://webtechdirectory.com/listings13011559/bip-32-word-list-new-step-by-step-map-for-bip39