Alternative words for crystal dragon include various terms related to fantasy and mythology. Words like "wyvern," "drake," and "serpent" are all variations of mythical creatures with dragon-like qualities. Some more specific terms include "ice dragon," "gem dragon," and "crystal wyrm." These words can be used to describe a dragon made of crystal or other precious materials, as well as a dragon that possesses the qualities associated with these names. The use of synonyms like these can add depth and interest to any writing that includes dragons or other fantasy creatures, helping to create a rich and vibrant imaginary world.