Bir or Birr: How To spell?
The word Bir is misspelled against Birr, a noun meaning "A rush or impetus; force."
Birr has double 'rr' in the end mispronounced as 'r'Remember double 'RR' appears in the end of this word which should not be misspelled with single 'R'
Wrong Spelling:  bi-r  Correct Spelling:  bi-rr 
Find more wrongly spelled words of Birr to spell it well.