Area and Lot

Area noun - A part or portion having no fixed boundaries.

Lot is a synonym for area in place topic. In some cases you can use "Lot" instead a noun "Area", when it comes to topics like plot, tract.

Lot noun - A small piece of land that is developed or available for development.

Area is a synonym for lot in plot topic. Sometimes you can use "Area" instead a noun "Lot", if it concerns topics such as tract, patch of ground, piece of property.