What is a prefix for ease?

There isn't a single, commonly used prefix for "ease." However, depending on the context, you could use prefixes that convey similar meanings, such as:

* Facil-: This prefix means "easy" or "simple," and can be used to create words like "facilitate," "facile," and "facility."

* Com-: This prefix means "with" or "together," and can be used to create words like "comfortable" and "companionable."

* At-: This prefix means "to," "toward," or "near," and can be used to create words like "at ease."

* Le-: This prefix can sometimes indicate "easy" or "light," as seen in "leisure" and "levity."

Ultimately, the best prefix to use will depend on the specific meaning you want to convey.