Pertussis and Respiratory illness

Pertussis noun - A disease of the respiratory mucous membrane.

Respiratory illness and pertussis are semantically related. In some cases you can use "Respiratory illness" instead a noun "Pertussis".

Respiratory illness noun - A disease affecting the respiratory system.

Pertussis and respiratory illness are semantically related. Sometimes you can replace term "Pertussis" with "Respiratory illness", this terms are similar.