---
title: "BIP39 Words Starting with Z — 4 Mnemonic Seed Phrase Words"
url: "https://bip39-phrase.com/bip39-words/z/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

# BIP39 Words Starting with Z (4 words)

The 4 BIP39 words that start with Z run from #2045 [zebra](/bip39-word/zebra/) to #2048 [zoo](/bip39-word/zoo/) in the English wordlist: indexes 2044 to 2047, or **11111111100** to **11111111111** in binary, so all of them begin with the bits 111111111\. That is 0.2% of the 2048 words, the smallest letter group. In list order they are [zebra](/bip39-word/zebra/), [zero](/bip39-word/zero/), [zone](/bip39-word/zone/) and [zoo](/bip39-word/zoo/), from 3 to 5 letters long.

No two of them share their first three letters, so three letters identify all 4; only two-letter beginnings repeat: **"ze"** ([zebra](/bip39-word/zebra/) and [zero](/bip39-word/zero/)) and **"zo"** ([zone](/bip39-word/zone/) and [zoo](/bip39-word/zoo/)).

Two of the 4 words have look-alikes one letter away: [zero](/bip39-word/zero/) ([hero](/bip39-word/hero/)) and [zone](/bip39-word/zone/) ([bone](/bip39-word/bone/), [one](/bip39-word/one/), [ozone](/bip39-word/ozone/) and [tone](/bip39-word/tone/)). Read aloud, 6 pairs differ by a single sound, for example [zone](/bip39-word/zone/) /zəʊn/ and [loan](/bip39-word/loan/) /ləʊn/, [own](/bip39-word/own/) /əʊn/ or [phone](/bip39-word/phone/) /fəʊn/. One of the words appears in the official BIP39 test vectors: [zoo](/bip39-word/zoo/) (vectors #4, #8 and #12).

## All 4 BIP39 words starting with Z

| #    | Word                        | Binary      | IPA       | Prefix |
| ---- | --------------------------- | ----------- | --------- | ------ |
| 2045 | [zebra](/bip39-word/zebra/) | 11111111100 | /ˈziːbrə/ | zebr   |
| 2046 | [zero](/bip39-word/zero/)   | 11111111101 | /ˈzɪərəʊ/ | zero   |
| 2047 | [zone](/bip39-word/zone/)   | 11111111110 | /zəʊn/    | zone   |
| 2048 | [zoo](/bip39-word/zoo/)     | 11111111111 | /zuː/     | zoo    |

## Similar-looking words to check

 These 5 pairs differ by one letter, with at least one word starting with Z. Both words are valid, so a slip between them passes the word check and only the checksum can catch it. 

- [bone](/bip39-word/bone/) [zone](/bip39-word/zone/)
- [hero](/bip39-word/hero/) [zero](/bip39-word/zero/)
- [one](/bip39-word/one/) [zone](/bip39-word/zone/)
- [ozone](/bip39-word/ozone/) [zone](/bip39-word/zone/)
- [tone](/bip39-word/tone/) [zone](/bip39-word/zone/)

[ Full BIP39 Wordlist (all 2048 words) ](/#wordlist)