Astere or Austere: How To spell?

The word Astere is misspelled against Austere, meaning "severely moral and strict simple and plain"

Word begins with consecutive vowels 'AU' followed by alphabets 'stere' is misspelled as 'A' as letter 'U' is phonetically ignore
Wrong Spelling: a-stere
Correct Spelling: au-stere
Explore spell check of Austere to spell without errors.