Any source which can make light is a source of light.
E.g.- Sun and other stars, fires, torches, light bulb, lamps etc.
Also some animals like fireflies, glow-worms, are sources of light because they make their own light to attract mates.
Reflectors of light cannot make their own light. They just reflect light.
E.g. – The Moon, mirrors
Mirrors do not make their own light. They just reflect light. That is why you cannot see a mirror in a completely dark room.
No,it isn’t. The moon is not a source of light because it just reflects light from the Sun.