I was stuck on '1 short' and reduced to going through the words I had to see if I could pin a suffix (-ity / -icity / -ilty etc) onto any of them. I thought lacticity - 'the state of being lactic' - might be possible, but 'sorry, not known'.
Then, quite out of the blue, I learned about tactility - 'the state of being tactile'.
I'd never seen the word before and probably never will again in any truly meaningful context.
I wonder how many of the other 27 who played it knew it as a word or, like me, just stumbled across it by accident.