Primary atypical pneumonia and Respiratory disorder

Primary atypical pneumonia noun - An acute respiratory disease marked by high fever and coughing; caused by mycoplasma; primarily affecting children and young adults.

Respiratory disorder and primary atypical pneumonia are semantically related. In some cases you can use "Respiratory disorder" instead a noun phrase "Primary atypical pneumonia".

Respiratory disorder noun - A disease affecting the respiratory system.

Primary atypical pneumonia and respiratory disorder are semantically related. Sometimes you can replace phrase "Primary atypical pneumonia" with "Respiratory disorder", this phrases are similar.