| * ''The Monster, or The Monstah'' - [[Fenway Park]]'s 37 foot left field wall, also known as [[The Green Monster]] | | * ''The Monster, or The Monstah'' - [[Fenway Park]]'s 37 foot left field wall, also known as [[The Green Monster]] |
| * ''The Mother Church'' - The [[First Church of Christ, Scientist, Boston|First Church of Christ, Scientist in Boston]], both the actual building in the [[Back Bay]] and, among Christian Scientists, the church institution headquartered there. | | * ''The Mother Church'' - The [[First Church of Christ, Scientist, Boston|First Church of Christ, Scientist in Boston]], both the actual building in the [[Back Bay]] and, among Christian Scientists, the church institution headquartered there. |
| * ''Mumbles'' - Long-time Boston mayor Thomas Menino, known for his malapropisms. | | * ''Mumbles'' - Long-time Boston mayor Thomas Menino, known for his malapropisms. |
| * ''Murderpan'' - derogatory name for [[Mattapan, MA]] | | * ''Murderpan'' - derogatory name for [[Mattapan, MA]] |