The term 'causing disease' can be described by four words: PESTILENTIAL (12 letters), pathogenic (10 letters), morbific (8 letters) and PESTILENT (9 letters). PESTILENTIAL means causing or tending to cause plague or epidemic disease, while pathogenic refers to something that is capable of causing disease. Morbific means having the power to cause disease, and PESTILENT means causing or tending to cause pestilence or plague. All four words describe something that is capable of causing disease.