Greath or Greith: How To spell?

The word Greath is misspelled against Greith, a verb meaning "To make ready; -- often used reflexively."

Word contains consecutive vowels 'EI' in between alphabets gr & th is misspelled as 'EA'
Wrong Spelling:  gr-ea-th 
Correct Spelling:  gr-ei-th 
Explore spell check of Greith to spell without errors.