What does "adenoma" mean versus "adenocarcinoma"?

An adenoma is a benign tumor arising from glandular tissue, from aden meaning gland and oma meaning tumor. Common examples include pituitary adenomas, thyroid adenomas, and colon polyps classified as adenomas. An adenocarcinoma is a malignant cancerous tumor arising from glandular tissue, from aden meaning gland, carcin meaning cancer, and oma meaning tumor. Adenocarcinomas are the most common type of cancer in the lung, colon, pancreas, and prostate. The key distinction is that adenoma is benign and does not spread, while adenocarcinoma is malignant and can metastasize to other organs.