It's a word that's already complete on its own. However, you can use prefixes to create related words with different meanings, such as:
* Intermingle: to mix together, especially in a way that is not easily separated.
* Commingle: to mix together, especially in a way that is not easily separated (often used for liquids or funds).
These words are formed by adding the prefixes "inter-" and "com-" to the base word "mingle".