- mew
- mewl
- modeling artist
- microbial
- middling
- midget
- midstream
- mightiest
- migrant
- muck about, muck around
- milieu
- military armour
- masticate
- militate
- merchandise
- missive
- mindless of
- miffed
- mine
- mineral wax
- minimum
- metropolis
- ministry
- mink
- minuet
- minute
- mischance
- mischievous
- misdeed
- misdemeanour
- miserable
- misfit
- misfortune
- mishandle
- missed aim
- mission
- messenger
- might
- misstate
- misstatement
- merry-go-round
- mist
- mistress of the seas
- misunderstanding
- memorize
- mockery
- mocking
- mocking bird
- modelling
- moth-eaten
- modificatory
- modify
- modus operandi
- mohammed
- mobilize
- molecular biology
- moleskin
- molest
- mollusc
- molluscum contagiosum
- molotov cocktail
- moment
- monandry
- marauder
- manufacture
- monocot
- monodrama
- monogamist
- monopolist
- monosyllable
- monotheistic
- monotone
- monotonous
- moral law
- make someone's hackles rise
- morass
- make the grade
- mystery
- more information
- more kicks than half penny
- mycology
- muzzle
- mirth
- mutual
- motion
- motionless
- motive
- mutilate
- much awaited
- muster in force
- muddiness
- muss
- muddled
- muffled
- multi-storied
- muddle along, muddle through
- musical chairs
- model
- muster
- mutation