* Newly coined words: Words invented recently, like "internet" or "selfie," don't have a root word in the traditional sense. They are created from scratch.
* Proper nouns: Names of people, places, and things (like "John," "Paris," or "iPhone") are not typically considered to have root words. They are often unique and not derived from other words.
* Onomatopoeia: Words that imitate sounds, like "meow," "buzz," or "crash," don't have a root word. They are formed based on the sound they represent.
While many words have roots, these categories demonstrate that the concept of a root word doesn't apply to all words.