* Amiable: Friendly, pleasant, and easy to get along with.
* Amicable: Friendly and peaceful, typically used to describe a situation or relationship.
* Amity: Friendship, harmony, and goodwill.
* Amorous: Showing, feeling, or relating to romantic love.
* Enemy: This word actually comes from the Latin "inimicus," meaning "not friendly."
While these are the most common derivatives, there are a few less common ones like "amicitia" (meaning "friendship") and "amice" (meaning "a vestment worn by priests and deacons").
Let me know if you want to learn more about the etymology of these words!