This is a video of all the words spoken in Star Wars sorted alphabetically, complete with all the scenes in which they were spoken and a counter of how many times. As you can see, lightsaber was only said once. Sadly, photon-penis-torpedo was never spoken, although it certainly should have been.
Keep going for the video.
Thanks to Lukas, who, prior to watching this video, was convinced ain't nobody got time for that.