With regards to breast cancer, what is a lump?

Tumor: When referring to a cancerous lump, most people are describing a tumor that they can palpate, rather than one identified by mammography. Of course, "lump" is a very generic term--most breast lumps are not cancers. However, it requires medical evaluation to differentiate benign from malignant ones.

Not sure: What you are asking. Breast cancer, if large enough, can form a lump in the breast that you or your doctor can feel.