Dorstone or Doorstone: How To spell?

The word Dorstone is misspelled against Doorstone, a noun meaning "The stone forming a threshold."

Doorstone has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings d & rstone which should not be misspelled with single 'O'
Wrong Spelling:  d-o-rstone 
Correct Spelling:  d-oo-rstone 
Find more incorrect spellings of Doorstone to spell right way.

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