mamm/o, mast/o
mamm/o and mast/o both mean breast (Greek/Latin).
"MAM-oh / MASS-toh." Coach: "Mamm and mast both mean breast."
Examples: mammary, mammogram, mammography, mammoplasty, mammalgia.
Also: mastectomy, mastitis, mastalgia, mastopexy, gynecomastia.