---
title: "BIP39 Word #708: flash — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/flash/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #708 01011000011 

# flash — BIP39 word #708

"**flash**" is word #708 of the 2048 words in the official BIP39 English wordlist, between [flame](/bip39-word/flame/) and [flat](/bip39-word/flat/). In a seed phrase it stands for the 11-bit value `01011000011`, decimal index 707\. 

/flæʃ/  · _noun:_ a sudden brief burst of bright light 

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

## Binary Representation

Five 1-bits and six 0-bits; 462 of the 2048 indexes have exactly five 1-bits.

One wrong bit turns it into (leftmost bit first):

[such](/bip39-word/such/)[blur](/bip39-word/blur/)[journey](/bip39-word/journey/)[embody](/bip39-word/embody/)[expire](/bip39-word/expire/)[fragile](/bip39-word/fragile/)[foil](/bip39-word/foil/)[floor](/bip39-word/floor/)[flight](/bip39-word/flight/)[flag](/bip39-word/flag/)[flame](/bip39-word/flame/) 

Position

Hex Index

0x2C3

4-Letter Prefix

flas

## About "flash" in BIP39

- "flash" has 5 letters, but the first four, **"flas"**, already identify it, because **"fla"** also begins [flag](/bip39-word/flag/), [flame](/bip39-word/flame/), [flat](/bip39-word/flat/) and [flavor](/bip39-word/flavor/).
- **"flas"** is unique only within the English list: it also begins flasque in the [French list](/french/), so a four-letter backup should say which list it uses.
- "flash" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #18 (word 16 of 24). 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 #18

[panda](/bip39-word/panda/) [eyebrow](/bip39-word/eyebrow/) [bullet](/bip39-word/bullet/) [gorilla](/bip39-word/gorilla/) [call](/bip39-word/call/) [smoke](/bip39-word/smoke/) [muffin](/bip39-word/muffin/) [taste](/bip39-word/taste/) [mesh](/bip39-word/mesh/) [discover](/bip39-word/discover/) [soft](/bip39-word/soft/) [ostrich](/bip39-word/ostrich/) [alcohol](/bip39-word/alcohol/) [speed](/bip39-word/speed/) [nation](/bip39-word/nation/) flash [devote](/bip39-word/devote/) [level](/bip39-word/level/) [hobby](/bip39-word/hobby/) [quick](/bip39-word/quick/) [inner](/bip39-word/inner/) [drive](/bip39-word/drive/) [ghost](/bip39-word/ghost/) [inside](/bip39-word/inside/) 

## Word #708 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kurt 

[French](/french/) époque 

[Italian](/italian/) fulmine 

[Japanese](/japanese/) ざいげん 

[Korean](/korean/) 분필 

[Portuguese](/portuguese/) enraizar 

[Spanish](/spanish/) ficha 

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

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

## Similar Words — Check Carefully During Recovery

 One BIP39 word differs from "flash" by just a single letter — the most common source of typos when a seed phrase is entered by hand: 

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

Read aloud, "flash" /flæʃ/ is one sound away from these 2 words: 

[flag /flæg/](/bip39-word/flag/)[flat /flæt/](/bip39-word/flat/) 

Words sharing the first three letters "fla":

[flag](/bip39-word/flag/)[flame](/bip39-word/flame/)[flat](/bip39-word/flat/)[flavor](/bip39-word/flavor/) 

## More BIP39 Words Starting with "F"

[ #704 fitness ](/bip39-word/fitness/)[ #705 fix ](/bip39-word/fix/)[ #706 flag ](/bip39-word/flag/)[ #707 flame ](/bip39-word/flame/)[ #709 flat ](/bip39-word/flat/)[ #710 flavor ](/bip39-word/flavor/)[ #711 flee ](/bip39-word/flee/)[ #712 flight ](/bip39-word/flight/) 

[View all words starting with "F" ](/bip39-words/f/) 

## Seed phrase, key and recovery guides

- [BIP 32 Explained: Hierarchical Deterministic Wallets](/bip-32/)
- [Can You Guess a Seed Phrase? Probability and Real Risks](/can-you-guess-a-seed-phrase-probability-and-real-risks/)
- [Crypto Inheritance: How to Pass On Your Seed Phrase](/crypto-inheritance/)

[ Full BIP39 Wordlist ](/)