The Correct spelling is: pneumonia
Common misspellings of the word pneumonia are:
How do you spell pneumonia?. It is not
An acute or chronic disease marked by inflammation of the lungs and caused by viruses, bacteria, or other microorganisms and sometimes by physical and chemical irritants.
[New Latin, from Greek pneumoniÄ, lung disease, alteration (influenced by pneuma, breath) of pleumoniÄ, from pleumÅn, lung.]