Technically the earth hasn't cleared it's orbit because of the moon.

So the earth is not a planet.

If we're going down to that level of pedentry (and why not?), the Earth is not a planet in that sense, it's part of a double-planet system.

That was Alan Stern's take if I recall correctly.

The Moon is ~2% the volume of the Earth, you are stretching the definition of similar pretty hard.

Also when you take into account that the moon is formed from the outer layers of the earth it lacks a lot of the heavy elements like iron that the Earth has in it's core making the mass about 1.2% of the mass of the Earth [1].

It's much smaller compared to the earth than you would think just by looking at it but it is still a very large moon for a planet the size of the Earth.

"Of all the moons of the eight planets, Earth's moon is by far the largest relative to its planet, with a diameter of 3476 km and hence a ratio to Earth's diameter of 0.2764. By comparison, the next largest moon relative to a major planet (Triton of Neptune) has a diameter ratio of just .0546." [2]

The moon is also larger than Pluto (in the same reference as above) :)

[1] https://www.universetoday.com/20489/moon-compared-to-earth/

[2] https://en.wikibooks.org/wiki/General_Astronomy/Planetary_Mo...