How do you say disease in Japanese?
— 病気 (びょうき, byōki); 疾病 (しっぺい, shippei); 病気

Generic synonyms for disease in Japanese
illness病気 (びょうき, byōki); 疾病 (しっぺい, shippei)
Specialized synonyms for disease in Japanese
anthrax炭疽症 (たんそしょう, tansoshō)