---
title: "BIP39 Word #1640: smooth — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/smooth/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1640 11001100111 

# smooth — BIP39 word #1640

"**smooth**" is word #1640 of the 2048 words in the official BIP39 English wordlist, between [smoke](/bip39-word/smoke/) and [snack](/bip39-word/snack/). In a seed phrase it stands for the 11-bit value `11001100111`, decimal index 1639\. 

/smuːð/  · _adjective:_ having an even surface without bumps or rough areas 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): гладкий 

## 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):

[erupt](/bip39-word/erupt/)[mind](/bip39-word/mind/)[undo](/bip39-word/undo/)[table](/bip39-word/table/)[shaft](/bip39-word/shaft/)[similar](/bip39-word/similar/)[solve](/bip39-word/solve/)[social](/bip39-word/social/)[small](/bip39-word/small/)[smile](/bip39-word/smile/)[smoke](/bip39-word/smoke/) 

Position

Hex Index

0x667

4-Letter Prefix

smoo

## About "smooth" in BIP39

- "smooth" has 6 letters, but the first four, **"smoo"**, already identify it, because **"smo"** also begins [smoke](/bip39-word/smoke/).

## Word #1640 in the Other 9 BIP39 Wordlists

[Czech](/czech/) svazek 

[French](/french/) replier 

[Italian](/italian/) sfilato 

[Japanese](/japanese/) ひつよう 

[Korean](/korean/) 진짜 

[Portuguese](/portuguese/) reduzida 

[Spanish](/spanish/) ronco 

[Traditional Chinese](/chinese-traditional/) 炎 

[Simplified Chinese](/chinese-simplified/) 炎 

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "smo":

[smoke](/bip39-word/smoke/) 

## More BIP39 Words Starting with "S"

[ #1636 small ](/bip39-word/small/)[ #1637 smart ](/bip39-word/smart/)[ #1638 smile ](/bip39-word/smile/)[ #1639 smoke ](/bip39-word/smoke/)[ #1641 snack ](/bip39-word/snack/)[ #1642 snake ](/bip39-word/snake/)[ #1643 snap ](/bip39-word/snap/)[ #1644 sniff ](/bip39-word/sniff/) 

[View all words starting with "S" ](/bip39-words/s/) 

## Seed phrase, key and recovery guides

- [Bitcoin Improvement Proposal (BIP): Process and Deployed BIP List](/bitcoin-improvement-proposal/)
- [TON Seed Phrase: 24-Word Format vs 12-Word BIP39 Phrases](/seed-phrase-format-for-ton-wallets/)
- [Recover Lost Bitcoin: Find Wallet Backups and Seed Phrases](/recover-lost-bitcoin-find-wallet-backups/)

[ Full BIP39 Wordlist ](/)