Has anyone ever wondered about the origin for these two mid-sixties Beatles albums? I have, indeed. I have wondered why the titles seemed somewhat unrelated to any of the songs on the albums. So, I utilized my companion wikipedia to determine the origins. After intensive research, I discovered that Rubber Soul was named by McCartney after he heard an interview with Mick Jagger where Mick Jagger's singing style was referred to as "plastic soul." It is simply a parody of this.
And Revolver? That is simply a pun. It refers to the handgun, but also to the motion records make. Why this means anything to the album, I know not; however, it was better than most of their other possible titles: Abracadabra, After Geography (play on Rolling Stones' Aftermath), or Beatles on Safari.