- masterwork
- mastery
- mastic
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- mastiff
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- masturbation
- mat
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- material
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- maternal
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- math
- mathematical
- mathematician
- mathematics
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- matinée
- mating call
- mating season
- matriarch
- matrices
- matriculate
- matriculation
- matrimonial
- matrimony
- matrix
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- matronly
- matt
- matted
- matter
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- matter-of-fact
- matting
- mattress
- mature
- mature student
- maturity
- maudlin
- maul
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- mausoleum
- mauve
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- max.
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- maximum
- may
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- mayday
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- mayonnaise
- mayor
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- maypole
- maze
- MB
- MBA
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- MCAT
- McCoy
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- MD
- MDT
- me
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- meadow
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- meals on wheels
- mealtime
- mealy-mouthed
- mean
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- meaning
- meaningful
- meaningless
- meanness
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- meant
- meantime
- meanwhile
- measles
- measly
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- measure
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- measurement
- measuring jug
- measuring tape
- meat
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- meatball
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- Mecca
- mechanic
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- mechanical engineering
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- MEd
- medal
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- meddle
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- media
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- mediaeval
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- medic
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- medication
- medicinal
- medicine
- medicine man
- medieval
- mediocre
- mediocrity
- meditate
- meditation
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- medium
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- medium-dry
- medium-sized
- medley
- meek
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- meet
- meeting
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- mega-
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- megalomania
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- megaphone
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- member
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- Member of Parliament
- membership
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- membrane