> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vowen.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Dictionary & Vocabulary
> Teach Vowen your specialized terminology.
## Custom Vocabulary
Add words and phrases that the transcription model should recognize. This is especially useful for:
* Product names (Kubernetes, PostgreSQL, Figma)
* People's names (unusual spellings)
* Industry jargon and acronyms
* Company-specific terminology
## Adding Words
1. Open the Vowen app and click **Dictionary** in the left sidebar
2. The **Dictionary** tab is selected by default (you'll also see **Threads** and **Expansions** tabs)
3. Click **+ Add Word** in the top right
4. Type your word or phrase and save
Once your dictionary grows, use the **search bar** at the top of the tab to filter the list and find an entry fast.
## How It Works
Custom vocabulary words are provided as "hints" to the transcription model. This helps the model recognize these terms during speech-to-text processing, improving accuracy for domain-specific language.
Custom vocabulary works with most local models that support prompting (Small and larger). It may not have an effect on Tiny or cloud models that don't support vocabulary hints.
## Dictionary vs Threads
The same **Dictionary** page in the sidebar also hosts a **Threads** tab. Threads are a separate feature: text replacement rules that swap one phrase for another *after* transcription completes. Use Dictionary when the model can't recognize a word at all; use [Threads](/features/threads) when it recognizes the word but spells it wrong.
| Feature | Dictionary (Vocabulary) | [Threads (Snippets)](/features/threads) |
| ------------ | ------------------------------------- | --------------------------------------------- |
| Purpose | Help the model *recognize* a word | *Replace* one phrase with another |
| When applied | During transcription | After transcription |
| Example | Add "Kubernetes" so it's recognized | Replace "cube nets" with "Kubernetes" |
| Use when | Model doesn't recognize a term at all | Model recognizes the term but spells it wrong |
## Tips
* Add the exact spelling you want (the model will try to match it)
* Include both the full form and abbreviation if relevant
* You don't need to add common English words, only specialized terms
**Pro tip:** If a word is consistently misspelled even after adding it to the Dictionary, create a [Thread](/features/threads) replacement as a backup. The Dictionary nudges the model in the right direction during transcription; the Thread guarantees the final output is correct.
## Auto-add Corrections to Dictionary
Auto-add corrections is a Pro feature.
When enabled, Vowen watches the edits you make to transcriptions and silently grows your Dictionary with the words you keep correcting. The next recording uses the updated vocabulary, so the same correction stops being necessary. Toggle it in **Settings > Dictionary > Auto-add corrections**.