What is the prefix of encouragement?

There isn't a single prefix that means "encouragement." However, there are several prefixes that can be used to create words related to encouragement, depending on the specific meaning you want to convey:

* En- is the most common prefix used to create words related to encouragement, like "encourage" itself.

* Up- can be used to create words that mean "to increase or improve," which can be seen as encouraging, like "uplift" or "upbeat."

* Em- can be used to create words related to "giving power or strength," which can also be seen as encouraging, like "empower" or "embolden."

* Re- can be used to create words related to "restoring or renewing," which can be encouraging in a context of overcoming challenges, like "reinforce" or "rekindle."

Ultimately, the best prefix to use depends on the specific context and the intended meaning.