Ghon focus is a term that refers to a diagnostic feature of tuberculosis. It is a lesion of the lung that consists of a primary focus of infection and an associated lymph node. This combination is known as a Ghon complex. However, there are several synonyms for the term Ghon focus. Some of the common synonyms include primary lesion, primary focus, tuberculous granuloma, and tuberculous infection. These terms are often used interchangeably with Ghon focus in medical literature and discussions. While the term may differ, they all refer to the same pathological entity associated with tuberculosis infection.