Is flat Earth considered to be a planet per FET?
RET planet = A planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
Does FET use the RET definition for the other planets?
If flat Earth is not a planet (per RET definition), then what is flat Earth?
Here is the answer from the FET FAQ:
A: The Earth is not one of the other planets. The Earth is special and unlike the other bodies in numerous ways.
Special in what way? What is the difference between flat Earth and the planet Mars?