"Epizootic" and "contagious rhinitis" are two synonyms for "epidemic catarrh." "Epizootic" refers to a disease that spreads rapidly throughout a particular animal population, while "contagious rhinitis" specifically describes an infection of the nasal passages that can be transmitted from one person to another. Both terms carry a sense of urgency and the potential for widespread outbreak, highlighting the seriousness of this type of illness. Along with other synonyms like "influenza," "flu," or "cold," these words underscore the importance of taking precautions to prevent the spread of disease and following recommended protocols for treatment and care.