* Megalomania: An obsession with grandeur or power.
* Megaphone: A cone-shaped device used to amplify sound.
* Megabyte: A unit of digital information equal to 1,048,576 bytes.
* Megascopic: Visible to the naked eye.
* Megalith: A large, prehistoric stone monument.
* Megastore: A very large retail store.
* Megastar: A very famous and successful person.
* Megafauna: Large animals, especially those that were extinct in prehistoric times.
* Megacity: A very large city with a population of over 10 million people.
It's important to remember that "mega" is often used as a prefix, meaning it is attached to the beginning of a word to modify its meaning. So, you'll find "mega" in many words that are not directly listed here.