The words "reserve" and "reserved" are related, but they serve different grammatical functions and can have different meanings depending on the context.

• Reserve (verb): To keep back or save for future use, or to set aside for a specific purpose. For example, "I will reserve a seat for you at the concert."
• Reserved (adjective): Describes someone who is slow to reveal emotions or opinions, or something that is set aside for a specific person or purpose. For example, "He is quite reserved, rarely sharing his feelings," or "These seats are reserved for VIP guests."

Additionally, "reserved" is the past tense of the verb "reserve," indicating that the action of reserving has already been completed. For example, "She reserved a table at the restaurant yesterday."

In summary, "reserve" is an action you might take, while "reserved" describes the state of something that has been set aside or the demeanor of a person who is not openly expressive¹.