The term "will-of-the-wisp" refers to something that is difficult to capture or understand, like a fleeting or elusive light in the darkness. Some other words that have a similar meaning include "phantasm," "mirage," "chimera," "wraith," and "specter." These words all evoke a sense of mystery or uncertainty, and suggest something ephemeral that is at once fascinating and intangible. They are often used to describe experiences that are hard to put into words, such as the feeling of a dream or the impression of a memory. Whatever the context, these synonyms for "will-of-the-wisp" offer a way to capture the ineffable and the unknowable, reminding us of the power of mystery and imagination.