Earthlight is a unique term used to describe the reflection of sunlight on Earth's surface in the dark side of the moon. While there are no perfect synonyms for this term, some possible alternatives might include the words "earthshine" or "lunar glow," which both describe the same phenomenon of light reflected from the Earth onto the moon. Other related terms might include "moonlight," "starlight," or "twilight," which all describe varying degrees of light seen in the night sky. Whether you are an astronomy enthusiast or just enjoy stargazing, understanding these terms can help you better appreciate the beauty and complexity of our universe.