What is the suffix and prefix of word companion?

The word "companion" doesn't have a prefix or suffix. It's a base word that means "someone who accompanies another person."

However, there are related words that use prefixes and suffixes:

* Uncompanionable: This uses the prefix "un-" meaning "not" to indicate someone who is not a good companion.

* Companionship: This uses the suffix "-ship" to indicate the state or quality of being a companion.

Let me know if you have any other words you'd like to analyze!