Is Sound and AudioClip of Unity3D similar?

I want know whether Sound and AudioClip of Unity3D are similar.I have a AudioClip object on unity3D.And I want to convert it to Sound or assign it to Sound…How can I do for it?

You are able to get the data out of the AudioClip and create a sound from it:
http://www.fmod.org/questions/question/load-an-audioclip-as-fmod-sound/#sabai-entity-content-41633