What term describes an abnormal growth of cells?

The term "tumor" refers specifically to an abnormal growth of cells. Tumors can result from various factors, including genetic mutations or environmental influences, and they can be classified as either benign or malignant based on their characteristics and behavior. Benign tumors are non-cancerous and typically do not spread to other parts of the body, while malignant tumors are cancerous and can invade surrounding tissues and metastasize.

In the context of this question, the other terms relate to specific types of tumors or conditions but do not accurately define the general concept of abnormal cell growth. For instance, "malignant" specifically pertains to cancerous growths, while "benign" refers to non-cancerous growths. The term "lesion" describes any abnormal change in tissue but is broader and does not specifically denote a growth. Therefore, "tumor" is the most precise term for describing an abnormal growth of cells.