Russian Hunspell Dictionary

This repository contains a modern Russian Hunspell dictionary intended for use with Mozilla Firefox, Mozilla Thunderbird, LibreOffice, CSpell, and other Hunspell-compatible applications.

The dictionary is distributed under the Mozilla Public License 2.0 (MPL 2.0).

Release 1.0.5

Release 1.0.5 substantially improves correction suggestions while preserving all 550,291 Hunspell entries and their morphology from 1.0.4.

• Held-out top-1 correct suggestions: 109 → 146.
• Held-out top-5 correct suggestions: 165 → 192.
• Held-out targets found at any rank: 169 → 197.
• The user-reported сабака → собака correction is ranked first in Hunspell, Firefox, and LibreOffice.
• ru_RU.aff SHA-256: 3c77ccd923ebfc686fd7ff7a33c5b42b762634d42e0ecd53081a58f09fc4ab74
• ru_RU.dic SHA-256: d1b727cd2c059e7ec7850808fe610ae2ca5ea07de768484ac6344aba89947438
• Firefox/Thunderbird XPI SHA-256: fb720f2309f8eb7b954fb0e971235132d1c07b05ea759814567701ecb8c3cc25
• CSpell word list: 2,342,788 UTF-8 words, SHA-256 ec026b1bb187e11fb20ac863c8d4c15fb304ec16126c47d9730a8635060083b2.

The release changes only Hunspell suggestion directives (TRY and REP). Direct recognition, dictionary entries, affix morphology, and the generated CSpell word list are unchanged from 1.0.4.

Files

• ru_RU.aff and ru_RU.dic — source Hunspell dictionary.
• LICENSE — licensing information and required notices.
• mozilla-add-on/ — ready-to-upload Mozilla dictionary add-on XPI.
• cspell/ — CSpell package generated from the same Hunspell sources.
• libreoffice-extension/ — metadata used to build the LibreOffice/OpenOffice OXT.

LibreOffice and OpenOffice extension

Build and validate the extension from the repository root:

scripts/build-libreoffice-oxt.sh
scripts/validate-libreoffice-oxt.sh

The generated file is dist/ru-spelling-dictionary-<version>.oxt. Install it through LibreOffice Extension Manager or run unopkg add --force ./dist/ru-spelling-dictionary-<version>.oxt, then restart LibreOffice.

Encoding and privacy

The Hunspell files use SET KOI8-R; do not recode them independently. The packages contain dictionary data and metadata only: no executable add-on scripts, permissions, telemetry, analytics, or network access.

Licensing

Copyright © 2026 Valery Ledovskoy. See LICENSE for MPL-2.0 terms and preserved upstream notices.