And "potsherd" is a fairly common word in the Southwest (that's where I heard it.) But unless you're somewhere where pottery is a common topic of conversation, and/or where theft of pottery from remote areas and/or archeological sites is a major problem, it probably wouldn't come up.
And not only can yogurt be spelled a couple of different ways, it can be pronounced a couple of different ways; I dated an English guy that was always referring to YAHgurts.
