- Monad
- Monadic
- Monastically
- Mondayish
- Monde
- Money laundering
- Money makes the mare go
- Money purse
- Money talks
- Money-bag
- Moneyless
- Moneys worth
- Monger
- Mongolian
- Mongoose
- Mongraphist
- Monied
- Monies
- Monitory
- Monkey
- Monkey business
- Monkey-nut
- Monkeys
- Monocle
- Monoglot
- Monogram
- Monomaniacal
- Monopolistic
- Monopolize
- Monorhyme
- Monosepalous
- Monovalent
- Montane
- Monthly
- Moody
- Mooing of a cow
- Moolah
- Moon face
- Moon flower
- Moon set
- Moon-faced
- Moor land
- Moot
- Mop up
- Mope
- Moplah
- Moral duty
- Moral obligation
- Moreover
- Moral power
- Moral support
- Moral turpitude
- Moral victory
- Morality
- Moratorium
- Morbidity
- Mordant
- Mordantly
- More and more
- More of
- More so
- Mores
- Mormon
- Morn
- Moron
- Morpheme
- Morphic
- Morphogenesis
- Morsel
- Mortal remains
- Mortal sin
- Mortal weapon
- Mortal wounds
- Mortality table
- Mortally
- Mortgage
- Mortgaged
- Mortgagee
- Mortician
- Mortuary
- Mosaic law
- Mosfet
- Mosquito net
- Most noble
- Most probably
- Mote in person eye
- Motel
- Moth-eaten
- Mother country
- Mother nature
- Mother's maiden name
- Motherless
- Motherliness
- Motion
- Motion of no-confidence
- Motley
- Motor area
- Mug
- Mottled cloth
- Mouldiness