What is the diference between limphoma and limphocytosis

What is the diference between limphoma and limphocytosis ?

1) lymphoma, any one of various malignant tumors of the lymphatic tissue, such as lymphosarcoma.
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Cancer may also arise in tissues of the lymphatic system. This system is a network of vessels that returns fluids to the bloodstream and helps fight disease. Lymphatic cancer is called lymphoma. A well-known form of lymphoma is Hodgkin's disease, named after Thomas Hodgkin, the English physician who first described the disorder. Hodgkin's disease affects both young adults and older individuals. The most common lymphatic cancer is non-Hodgkin's lymphoma. Cases of non-Hodgkin's lymphoma have risen steadily since the mid-1900's. Many people with AIDS develop this type of cancer.

2) lymphocytosis, an excessive number of lymphocytes in the blood.
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Lymphocyte, one of the nearly colorless cells of the blood and lymphatic system, produced by lymph glands; lymph cell. Lymphocytes have a nucleus and are chiefly responsible for immunity. They defend the body against infection by producing antibodies and other substances that destroy viruses and other foreign bodies. B cells and T cells are lymphocytes.