Claostral or Claustral: How To spell?

The word Claostral is misspelled against Claustral, an adjective meaning "Cloistral."

Word contains consecutive vowels 'AU' in between alphabets cl & stral is misspelled as 'AO'
Wrong Spelling:  cl-ao-stral 
Correct Spelling:  cl-au-stral 
Find more incorrect spellings of Claustral to spell right way.

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