Grade 11.
- morphophonemic
- mort
- mortgages
- motivelessness
- moulin
- mountainousness
- muddleheadedness
- muley
- muller
- multiarticular
- multiarticulate
- multichanneled
- multiconductor
- multicrystalline
- multicylindered
- multidenticulate
- multidimensionality
- multifactorial
- multiflagellate
- multiflagellated