Upsters or Upstairs: How To spell?

The word Upsters is misspelled against Upstairs, an adjective meaning "Being above stairs; as, an upstairs room."

Word contains consecutive vowels 'AI' in between alphabets upst & rs is misspelled as 'E'
Wrong Spelling:  upst-e-rs 
Correct Spelling:  upst-ai-rs 
Explore spell check of Upstairs to spell without errors.

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