Heirspring or Hairspring: How To spell?

The word Heirspring is misspelled against Hairspring, a noun meaning "The slender recoil spring which regulates the motion of the balance in a timepiece."

Word contains consecutive vowels 'AI' in between alphabets h & rspring is misspelled as 'EI'
Wrong Spelling:  h-ei-rspring 
Correct Spelling:  h-ai-rspring 
Find more wrongly spelled words of Hairspring to spell it well.

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