Is spoken an adjective or adverb?

"Spoken" can be both an adjective and a past participle of the verb "speak".

Adjective:

* Example: "He gave a spoken warning." Here, "spoken" describes the type of warning (verbal, not written).

Past Participle:

* Example: "The poem was spoken by the actor." Here, "spoken" is part of the passive voice verb "was spoken".

To determine which part of speech "spoken" is in a specific sentence, look at its function. If it describes a noun, it's an adjective. If it's part of a verb phrase, it's a past participle.