What is the term for a figure of speech that compares two unlike things without using "like" or "as"?

The term that refers to a figure of speech comparing two unlike things without employing "like" or "as" is a metaphor. A metaphor directly states that one thing is another, allowing for a more implicit comparison that often conveys deeper meaning or highlights similarities between the two unlike entities. For instance, saying "Time is a thief" suggests that time can steal moments from our lives, without explicitly using "like" or "as," enhancing the imagery and emotional impact of the statement.

In contrast, a simile specifically uses "like" or "as" to make a comparison, an oxymoron combines contradictory terms for effect, and personification attributes human traits to non-human entities. By understanding these distinctions, it becomes clear why metaphor is the appropriate term in this context.