Common cold differs from pneumonia in, that
Pneumonia is caused by a virus while the common cold is caused by the bacterium Haemophilus influenzae
Pneumonia pathogen infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs
Pneumonia is a communicable disease whereas the common cold is a nutritional deficiency disease
Pneumonia can be prevented by a live attenuated bacterial vaccine whereas the common cold has no effective vaccine