The word cooking, to me, means using heat with a stove. Baking is for the oven. Grilling, is outside on a grill. But a sandwich is only ever "made" in my house. "Will you make me a sandwich?", "I'm making a sandwich"
I see cooking as a more general term. Both baking and grilling are forms of cooking. You can also roast and grill things in the oven. Cooking on a stove also has different specific terms, boiling, simmering, frying etc.
i think combining watery things and oily things counts as emulsion, which is a cooking sort of word. i thought "cooking" was a word for "changing the chemical properties of" or just "heating up because it's better hot"
I mean more general than heat with a stove. Not as is every form of meal preparation.
But yes. I would cook a salad - stir frys are basically just cooked salads with some rice or noodles. I would not consider every salad to be cooked though.