Infectious disease and Mononucleosis

Infectious disease noun - A disease transmitted only by a specific kind of contact.

Mononucleosis and infectious disease are semantically related. In some cases you can replace term "Mononucleosis" with "Infectious disease", this terms are similar.

Mononucleosis noun - An acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing.

Infectious disease and mononucleosis are semantically related. You can use "Infectious disease" instead a noun "Mononucleosis".