--- title: "BIP39 Word #1646: soap — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/soap/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #1646 11001101101 # soap — BIP39 word #1646 "**soap**" is word #1646 of the 2048 words in the official BIP39 English wordlist, between [snow](/bip39-word/snow/) and [soccer](/bip39-word/soccer/). In a seed phrase it stands for the 11-bit value `11001101101`, decimal index 1645\. /səʊp/ · _noun:_ a substance used with water for washing and cleaning [Russian](/ru/ "The BIP39 wordlist with Russian translations"): мыло ## Binary Representation Seven 1-bits and four 0-bits; 330 of the 2048 indexes have exactly seven 1-bits. One wrong bit turns it into (leftmost bit first): [ethics](/bip39-word/ethics/)[misery](/bip39-word/misery/)[unit](/bip39-word/unit/)[tank](/bip39-word/tank/)[shield](/bip39-word/shield/)[situate](/bip39-word/situate/)[soul](/bip39-word/soul/)[smile](/bip39-word/smile/)[snake](/bip39-word/snake/)[social](/bip39-word/social/)[snow](/bip39-word/snow/) Position Hex Index 0x66D 4-Letter Prefix soap ## About "soap" in BIP39 - "soap" has 4 letters, but the first three, **"soa"**, already identify it, because **"so"** also begins 20 other words, among them [soccer](/bip39-word/soccer/), [social](/bip39-word/social/), [sock](/bip39-word/sock/) and [soda](/bip39-word/soda/). Three letters are enough for only 604 of the 2048 words. - "soap" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #17 (word 10 of 18). Every official vector passes the [checksum checker](/bip39-checksum-checker/), and [How BIP39 works](/how-bip39-works/) shows how the entropy turns into such words. Official test vector #17 [horn](/bip39-word/horn/) [tenant](/bip39-word/tenant/) [knee](/bip39-word/knee/) [talent](/bip39-word/talent/) [sponsor](/bip39-word/sponsor/) [spell](/bip39-word/spell/) [gate](/bip39-word/gate/) [clip](/bip39-word/clip/) [pulse](/bip39-word/pulse/) soap [slush](/bip39-word/slush/) [warm](/bip39-word/warm/) [silver](/bip39-word/silver/) [nephew](/bip39-word/nephew/) [swap](/bip39-word/swap/) [uncle](/bip39-word/uncle/) [crack](/bip39-word/crack/) [brave](/bip39-word/brave/) ## Word #1646 in the Other 9 BIP39 Wordlists [Czech](/czech/) svrab [French](/french/) résineux [Italian](/italian/) sforzato [Japanese](/japanese/) ひはん [Korean](/korean/) 질병 [Portuguese](/portuguese/) refugiar [Spanish](/spanish/) rostro [Traditional Chinese](/chinese-traditional/) 冒 [Simplified Chinese](/chinese-simplified/) 冒 ## Similar Words — Check Carefully During Recovery 3 BIP39 words differ from "soap" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [snap](/bip39-word/snap/)[soup](/bip39-word/soup/)[swap](/bip39-word/swap/) Read aloud, "soap" /səʊp/ is one sound away from these 2 words: [hope /həʊp/](/bip39-word/hope/)[soul /səʊl/](/bip39-word/soul/) ## More BIP39 Words Starting with "S" [ #1642 snake ](/bip39-word/snake/)[ #1643 snap ](/bip39-word/snap/)[ #1644 sniff ](/bip39-word/sniff/)[ #1645 snow ](/bip39-word/snow/)[ #1647 soccer ](/bip39-word/soccer/)[ #1648 social ](/bip39-word/social/)[ #1649 sock ](/bip39-word/sock/)[ #1650 soda ](/bip39-word/soda/) [View all words starting with "S" ](/bip39-words/s/) ## Seed phrase, key and recovery guides - [12 vs 24 Word Seed Phrase: Which Is More Secure?](/12-vs-24-word-seed-phrase/) - [BIP 157 Client-Side Block Filtering: Compact Filters Explained](/bip-157-client-side-block-filtering/) - [Bitcoin Core Seed Phrase: Why There Is None and How to Back Up](/bitcoin-core-seed-phrase-backup-guide/) [ Full BIP39 Wordlist ](/)