Storcase or Staircase: How To spell?

The word Storcase is misspelled against Staircase, a noun meaning "A flight of stairs with their supporting framework, casing, balusters, etc."

Word contains consecutive vowels 'AI' in between alphabets st & rcase is misspelled as 'O'
Wrong Spelling:  st-o-rcase 
Correct Spelling:  st-ai-rcase 
Find more incorrect spellings of Staircase to spell right way.

You might be interested to know

Suzeron or Suzerain?

Thorntol or Thorntail?

Uncertonties or Uncertainties?