---
title: "BIP39 Word #665: fantasy — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/fantasy/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #665 01010011000 

# fantasy — BIP39 word #665

"**fantasy**" is word #665 of the 2048 words in the official BIP39 English wordlist, between [fancy](/bip39-word/fancy/) and [farm](/bip39-word/farm/). In a seed phrase it stands for the 11-bit value `01010011000`, decimal index 664\. 

/ˈfæntəsi/  · _noun:_ an imagined situation or story far from reality 

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

## Binary Representation

Four 1-bits and seven 0-bits; 330 of the 2048 indexes have exactly four 1-bits.

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

[spread](/bip39-word/spread/)[basic](/bip39-word/basic/)[indoor](/bip39-word/indoor/)[drink](/bip39-word/drink/)[force](/bip39-word/force/)[finish](/bip39-word/finish/)[extra](/bip39-word/extra/)[faith](/bip39-word/faith/)[fatal](/bip39-word/fatal/)[fashion](/bip39-word/fashion/)[farm](/bip39-word/farm/) 

Position

Hex Index

0x298

4-Letter Prefix

fant

## About "fantasy" in BIP39

- "fantasy" has 7 letters, but the first four, **"fant"**, already identify it, because **"fan"** also begins [fan](/bip39-word/fan/) and [fancy](/bip39-word/fancy/).
- Its first letters also spell another BIP39 word, [fan](/bip39-word/fan/). Write "fantasy" out in full: cut short, it turns into a different valid word.
- **"fant"** is unique only within the English list: it also begins fantasma in the [Italian list](/italian/), fantoche in the [Portuguese list](/portuguese/) and fantazie in the [Czech list](/czech/), so a four-letter backup should say which list it uses.

## Word #665 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kozoroh 

[French](/french/) encoche 

[Italian](/italian/) flamenco 

[Japanese](/japanese/) ごはん 

[Korean](/korean/) 복사 

[Portuguese](/portuguese/) educado 

[Spanish](/spanish/) existir 

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

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

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "fan":

[fan](/bip39-word/fan/)[fancy](/bip39-word/fancy/) 

## More BIP39 Words Starting with "F"

[ #661 family ](/bip39-word/family/)[ #662 famous ](/bip39-word/famous/)[ #663 fan ](/bip39-word/fan/)[ #664 fancy ](/bip39-word/fancy/)[ #666 farm ](/bip39-word/farm/)[ #667 fashion ](/bip39-word/fashion/)[ #668 fat ](/bip39-word/fat/)[ #669 fatal ](/bip39-word/fatal/) 

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

## Seed phrase, key and recovery guides

- [Metal Seed Phrase Backup: Steel Plates, Tiles and Tests](/metal-seed-phrase-backup/)
- [Invalid Seed Phrase? How to Find and Fix a Wrong Word (BIP39)](/how-to-fix-seed-phrase-errors/)
- [Ethereum Keystore File (JSON Wallet): Structure and Security](/json-wallets-explained/)

[ Full BIP39 Wordlist ](/)