To enhance the precision of words you know will recur often in your transcription, use the custom_vocabulary feature.
{
  "realtime_processing": {
    "custom_vocabulary": true,
    "custom_vocabulary_config": {
      "vocabulary": [
        "Westeros",
        {"value": "Stark"},
        {
          "value": "Night's Watch",
          "pronunciations": ["Nightz Watch"],
          "intensity": 0.4,
          "language": "en"
        }
      ],
      "default_intensity": 0.6
    }
  }
}
default_intensity
number
The global intensity of the feature (minimum 0, maximum 1, default 0.5).
vocabulary
object