That's exactly what I thought - I noted that you'd retained 6 letters from babybird's word! Changing up to four letters would be in line with the 7/8 and 9 letter games and just the right number (3 would be too restrictive with 10-letter words). Changing 6 or more letters just doesn't work very well in my view, you would end up with little or nothing of the original word!
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On a mountain range
I'm Doctor Strange