To determine if the other object is a meteoroid, the most relevant question would be:
Is the object smaller than one meter?
Meteoroids are typically defined as smaller than asteroids, and they range in size from a grain of sand to about one meter in diameter.
For the identification of a comet, the best question to ask would be:
Does it have a tail?
Comets are characterized by their tails, which are formed when they approach the Sun and the heat causes volatile materials to vaporize, releasing gas and dust.