" The argument that almost everybody has two tibiae is not very compelling. There are plenty of bones and other anatomical features that we all have without having heard of their names. It would be impossible to do the puzzle unless you have a lot of glia in your brain, but that doesn't make it a common word. "
anonsi , the above quote is taken from the response by Alan to a similar query in the tibia thread & may help explain why areola was played by such a small number of people & also why it is classed as a rare word.
I am not aware of a different word that can be used to describe that part of the breast but i could certainly provide a few alternatives that are used to describe the entire organ.
By the way, how do you actually calculate how many players have played any particular word?