A few days ago, in the ROCKABILLY puzzle of 16 May 2018, I missed the word carboy, which was classified as common. I did not know this word, and when I looked it up, I recognized what it was, although seeing the picture still did not jog any memory of the word in my mind. Since fewer than ten percent of the players found the word, I want to know whether most people know this word and just didn't find it, or is it actually not common?