- Modular
- Modus
- Modus operandi
- Mohammed
- Mohammedans
- Moisten
- Moistening
- Mojo
- Moldy
- Mole
- Molehill
- Moleskin
- Molester
- Moll
- Mollification
- Molluscum contagiosum
- Mom
- Monarch
- Monastery
- Monasticism
- Money bags
- Money-matter
- Money-order
- Monist
- Monitive
- Monitor lizard
- Monochord
- Monocratie
- Monogamous
- Monogamy
- Monogramtic
- Monographer
- Monolith
- Monomaniac
- Monosodium glutomate
- Monotheistic
- Monotherapy
- Monotone
- Monotony
- Monotreme
- Monsieur
- Monsignor
- Monster
- Monsterous
- Monstrous
- Mont blanc
- Monumental
- Mooch
- Mooch about
- Mood
- Moodily
- Moon blind
- Moonish
- Moonlight
- Moonlight in a forest
- Moons disc
- Moonshine
- Moony
- Moor fowl
- Mop
- Moplah jaggers
- Mops and mows
- Moral law
- Moral philosophy
- Moral police
- Moral way
- Morass
- Morbid
- Morbific
- More than
- Morello
- Moribund
- Morning
- Morning sickness
- Morning star
- Moronically
- Morose
- Morosely
- Morpheus
- Morrow
- Mortal
- Mortal agony
- Mortar board
- Mortification
- Mortify
- Mortise lock
- Mosaic
- Mosquito
- Mossy
- Most
- Most ancient
- Most common recent ancestor
- Most illustrious
- Most noble woman
- Mot
- Mother church
- Mother earth
- Mother like
- Mother state
- Mother-of-pearlshell