curl --request POST \
  --url https://api.callers.ai/campaigns/{campaignId}/vocabulary \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "vocabulary": [
    {
      "content": "<string>",
      "sounds_like": [
        "<string>"
      ]
    }
  ]
}
'

{
  "success": true,
  "totalCount": 123
}