Backstaor or Backstair: How To spell?

The word Backstaor is misspelled against Backstair, an adjective meaning "Private; indirect; secret; intriguing; -- as if finding access by the back stairs."

Word contains consecutive vowels 'AI' in between alphabets backst & r is misspelled as 'AO'
Wrong Spelling:  backst-ao-r 
Correct Spelling:  backst-ai-r 
Find more incorrect spellings of Backstair to spell right way.

You might be interested to know

Bewaolment or Bewailment?

Campaogner or Campaigner?

Claomless or Claimless?