---
title: "BIP39 Word #566: effort — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/effort/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #566 01000110101 

# effort — BIP39 word #566

"**effort**" is word #566 of the 2048 words in the official BIP39 English wordlist, between [educate](/bip39-word/educate/) and [egg](/bip39-word/egg/). In a seed phrase it stands for the 11-bit value `01000110101`, decimal index 565\. 

/ˈɛfət/  · _noun:_ physical or mental energy used to do something 

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

## 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):

[shop](/bip39-word/shop/)[allow](/bip39-word/allow/)[grit](/bip39-word/grit/)[find](/bip39-word/find/)[exchange](/bip39-word/exchange/)[dress](/bip39-word/dress/)[dwarf](/bip39-word/dwarf/)[element](/bip39-word/element/)[economy](/bip39-word/economy/)[eight](/bip39-word/eight/)[educate](/bip39-word/educate/) 

Position

Hex Index

0x235

4-Letter Prefix

effo

## About "effort" in BIP39

- Two letters are enough: no other BIP39 word begins with **"ef"**, which makes "effort" one of only 34 words that can be told apart this early.
- The same spelling is in the [French BIP39 wordlist](/french/), but as word #632 (index 631), not #566\. A wallet set to French reads "effort" as **01001110111** instead of **01000110101**, and decodes index 565 as "dimanche".
- "effort" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #24 (word 3 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 #24

[void](/bip39-word/void/) [come](/bip39-word/come/) effort [suffer](/bip39-word/suffer/) [camp](/bip39-word/camp/) [survey](/bip39-word/survey/) [warrior](/bip39-word/warrior/) [heavy](/bip39-word/heavy/) [shoot](/bip39-word/shoot/) [primary](/bip39-word/primary/) [clutch](/bip39-word/clutch/) [crush](/bip39-word/crush/) [open](/bip39-word/open/) [amazing](/bip39-word/amazing/) [screen](/bip39-word/screen/) [patrol](/bip39-word/patrol/) [group](/bip39-word/group/) [space](/bip39-word/space/) [point](/bip39-word/point/) [ten](/bip39-word/ten/) [exist](/bip39-word/exist/) [slush](/bip39-word/slush/) [involve](/bip39-word/involve/) [unfold](/bip39-word/unfold/) 

## Word #566 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kapusta 

[French](/french/) dimanche 

[Italian](/italian/) enzima 

[Japanese](/japanese/) けぶかい 

[Korean](/korean/) 박수 

[Portuguese](/portuguese/) decote 

[Spanish](/spanish/) dos 

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

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

## More BIP39 Words Starting with "E"

[ #562 economy ](/bip39-word/economy/)[ #563 edge ](/bip39-word/edge/)[ #564 edit ](/bip39-word/edit/)[ #565 educate ](/bip39-word/educate/)[ #567 egg ](/bip39-word/egg/)[ #568 eight ](/bip39-word/eight/)[ #569 either ](/bip39-word/either/)[ #570 elbow ](/bip39-word/elbow/) 

[View all words starting with "E" ](/bip39-words/e/) 

## Seed phrase, key and recovery guides

- [BIP38 Encrypted Private Keys: 6P Format and How to Decrypt](/bip38/)
- [BIP39 Passphrase: How the 25th Word Creates a Hidden Wallet](/bip39-passphrase/)
- [Is My Seed Phrase Compromised? Signs and What to Do Next](/bip39-seed-phrase-compromise/)

[ Full BIP39 Wordlist ](/)