Users working with commonly mis-transcribed words can use the Transcription Glossary to provide a list of proper spellings. This will improve the chances that an automatic transcription will return a correctly-spelled result.
Click on the drop-down arrow next to your project name and select Glossary from the list. Here you can add a list of uncommon words to improve the transcription process.
This feature does not yet work with Live Transcription. You can disable Live Transcription by clicking on the gear icon in the recording menu, and unchecking the box Automatically transcribe recording.