A tumour is an abnormal GROWTH of cells that can be benign or malignant. NEOPLASM is an 8 letter term for a new and abnormal GROWTH of tissue, which can be a tumour. GROWTH is a 6 letter term for an increase in size, which can also refer to a tumour. CANCER is a 6 letter term for a malignant tumour, which can spread to other parts of the body. CYST is a 4 letter term for a closed sac-like structure that can contain fluid, gas, or semi-solid material, which can also be a type of tumour. WEN is a 3 letter term for a sebaceous CYST, which is a type of tumour. Sarcoma is a 7 letter term for a malignant tumour of connective tissue, such as bone, muscle, fat, or blood vessels.