All terms
Domain Expert
Someone with real professional experience in a specific field (medicine, law, engineering, finance, etc.), hired specifically for that expertise rather than AI knowledge.
Most AI labs explicitly say no AI experience is required for domain-expert roles - what they need is your genuine professional judgment. A cardiologist evaluating medical reasoning, or a tax attorney reviewing contract analysis, is worth more to an AI lab than a generalist, because their judgment is what the model is being trained or tested against.
Example
A licensed CPA reviews an AI-generated tax explanation and flags a subtle error a non-accountant would never catch.