pneumatic |nuːmætɪk| — of or relating to or using air (or a similar gas)

pneumatics |nʊˈmætɪks| — the branch of mechanics that deals with the mechanical properties of gases

pneumonia |nuːˈməʊnɪə| — respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants

pneumonic |nuːˈmɑːnɪk| — pertaining to or characterized by or affected by pneumonia