Thanks for the hints! Have no idea why I got stuck on this one now I know what the answer is but I suppose that's the point. I'd never have got it without a nudge in the right direction.
I solved Semantle #108 in 59 guesses. My first guess had a similarity of 0.10. My first word in the top 1000 was at guess #17. My penultimate guess had a similarity of 18.01.