---
title: "BIP39 Word #420: crucial — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/crucial/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #420 00110100011 

# crucial — BIP39 word #420

"**crucial**" is word #420 of the 2048 words in the official BIP39 English wordlist, between [crowd](/bip39-word/crowd/) and [cruel](/bip39-word/cruel/). In a seed phrase it stands for the 11-bit value `00110100011`, decimal index 419\. 

/ˈkruːʃəl/  · _adjective:_ extremely important because other things depend on it 

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

## 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):

[refuse](/bip39-word/refuse/)[inner](/bip39-word/inner/)[behave](/bip39-word/behave/)[caught](/bip39-word/caught/)[detect](/bip39-word/detect/)[corn](/bip39-word/corn/)[cushion](/bip39-word/cushion/)[cube](/bip39-word/cube/)[crunch](/bip39-word/crunch/)[crouch](/bip39-word/crouch/)[crowd](/bip39-word/crowd/) 

Position

Hex Index

0x1A3

4-Letter Prefix

cruc

## About "crucial" in BIP39

- "crucial" has 7 letters, but the first four, **"cruc"**, already identify it, because **"cru"** also begins [cruel](/bip39-word/cruel/), [cruise](/bip39-word/cruise/), [crumble](/bip39-word/crumble/), [crunch](/bip39-word/crunch/) and [crush](/bip39-word/crush/).
- The same spelling is in the [French BIP39 wordlist](/french/), but as word #479 (index 478), not #420\. A wallet set to French reads "crucial" as **00111011110** instead of **00110100011**, and decodes index 419 as "cocotier".
- **"cruc"** is unique only within the English list: it also begins cruciale in the [Italian list](/italian/), so a four-letter backup should say which list it uses.

## Word #420 in the Other 9 BIP39 Wordlists

[Czech](/czech/) hnis 

[French](/french/) cocotier 

[Italian](/italian/) crisi 

[Japanese](/japanese/) きどう 

[Korean](/korean/) 독일 

[Portuguese](/portuguese/) cenoura 

[Spanish](/spanish/) cocción 

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

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

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "cru":

[cruel](/bip39-word/cruel/)[cruise](/bip39-word/cruise/)[crumble](/bip39-word/crumble/)[crunch](/bip39-word/crunch/)[crush](/bip39-word/crush/) 

## More BIP39 Words Starting with "C"

[ #416 crop ](/bip39-word/crop/)[ #417 cross ](/bip39-word/cross/)[ #418 crouch ](/bip39-word/crouch/)[ #419 crowd ](/bip39-word/crowd/)[ #421 cruel ](/bip39-word/cruel/)[ #422 cruise ](/bip39-word/cruise/)[ #423 crumble ](/bip39-word/crumble/)[ #424 crunch ](/bip39-word/crunch/) 

[View all words starting with "C" ](/bip39-words/c/) 

## Seed phrase, key and recovery guides

- [BIP39 vs BIP32 vs BIP44: How the Seed Standards Fit Together](/crypto-seed-standards-bip39-vs-bip32-vs-bip44/)
- [How to Memorize a Seed Phrase: Color, Story and Palace Methods](/seed-phrase-memory/)
- [What Is a Seed Phrase? How a Recovery Phrase Works](/recovery-seed-phrase-guide/)

[ Full BIP39 Wordlist ](/)