Objects below a diameter of about 10 meters are called meteorites.
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Comet
An asteroid or a meteoroid
It is called a particle.
An asteroid is a heavenly body which has its own orbit, between mars and jupiter, and revolve around the sun. It is made up of dust and rock. Meteor is also a heavenly body like asteroid but smaller than that.
Asteroids are much smaller than Earth.
An asteroid is a rock that is far smaller than a planet or dwarf planet. They have no atmosphere. They may circle a sun or a planet.
A meteoroid is a sometimes called a shooting star. It is smaller than an asteroid, and made up of chunks of rock and ice.
That is called a meteorite. It is basically the same thing as an asteroid, but anything smaller than about 10 meters is called a meteorite.
An asteroid is basically a rock in space. A meteor is basically a space rock falling into our atmosphere. Therefore, meteors are asteroids that are falling into our atmosphere, there is no size comparison, only a location and action change.
Asteroids can be different sizes, so they can be larger or smaller than Mars.
Actually, that description fits two known objects in our solar system: Pluto and the asteroid Ceres.