1. tumor; tumour; neoplasm; neoplasiaMedicine, etc. term
Wikipedia definition
2. TumorA tumor or tumour is commonly used as a synonym for a neoplasm [a solid or fluid-filled (cystic) lesion that may or may not be formed by an abnormal growth of neoplastic cells] that appears enlarged in size. Tumor is not synonymous with cancer. While cancer is by definition malignant, a tumor can be benign, pre-malignant, or malignant, or can represent a lesion without any cancerous potential whatsoever. In many sources, the terms "mass" and "nodule" are often used synonymously with "tumor".
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