1. a person who takes part in a dialogue or conversation
Usage: less common than 'participant' or 'speaker'
2. a person who writes dialogues, especially for plays or films
Usage: rare; more commonly 'dialogue writer' or 'screenwriter'

Examples

• Each dialoger in the debate presented their own perspective.
• The two dialogers engaged in a thoughtful exchange about climate policy.
• As a skilled dialoger, she knew how to ask the right questions.
• The ancient philosopher was known as a great dialoger who questioned his students.
• In the play, the main dialoger carries most of the conversation.