Aastereness or Austereness: How To spell?

The word Aastereness is misspelled against Austereness, a noun meaning "Harshness or astringent sourness to the taste; acerbity."

Word begins with consecutive vowels 'AU' followed by alphabets 'stereness' is misspelled as 'AA'
Wrong Spelling:  aa-stereness 
Correct Spelling:  au-stereness 
Explore spell check of Austereness to spell without errors.

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