Herpes virus and Mononucleosis

Herpes virus noun - Any of the animal viruses that cause painful blisters on the skin.

Mononucleosis and herpes virus are semantically related. In some cases you can use "Mononucleosis" instead a noun phrase "Herpes virus".

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.

Herpes virus and mononucleosis are semantically related. You can use "Herpes virus" instead a noun "Mononucleosis".