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Hi sir/madam,

1. She has prepared/cooked food. Here can prepared and cooked be interchangeable?

2. If someone is visiting the hotel regularly and stays for at least 2 days every time he visits, will he be a customer to hotel or will he be a visitor?

Thank you so much in advance,

Regards,
Shravan.
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1. She has prepared/cooked food. Here can prepared and cooked be interchangeable?-- Not if it is just a salad: 'cooking' requires the application of heat.

2. If someone is visiting the hotel regularly and stays for at least 2 days every time he visits, will he be a customer to hotel or will he be a visitor?- Neither. He will be regular guest.
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Even in the case of food that requires cooking, it is prepared before it is cooked.

I've prepared the meal for this evening. I'll put it in the oven when Mary rings to say she's on her way.