Thereyt or Thereat: How To spell?

The word Thereyt is misspelled against Thereat, an adverb meaning "At that occurrence or event; on that account."

Thereat has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets ther & t is misspelled as 'EY'
Wrong Spelling:  ther-ey-t 
Correct Spelling:  ther-ea-t 
Explore spell check of Thereat to spell without errors.

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