- middle
- middlings
- mill
- million
- mission
- moke
- molasses
- mold
- momma
- monkey
- monkey-shine
- molestation
- moonlight
- moonshine
- moonshiner
- motion picture
- most
- motel
- moth-ball
- motivate
- motorcade
- mouthpiece
- moving picture
- mug
- mugwump
- molest
- molester
- mom
- moonlighting
- mortician
- moustache
- movie house
- mull
- mussiness
- mussy
- murder
- muscle
- mush
- mushroom
- mustache
- mustang
- muss
- mustard
- mute
- necessary
- necking
- New Deal
- news-hen
- news-room
- newsy
- nickel nurser
- navy
- neck
- needle
- news-dealer
- news-gatherer
- news-hawk
- news-sheet
- nifty
- night stick
- nightcap
- nitery
- no-good
- non-affiliated
- nine
- nipper
- nooning
- noble
- nominate
- nope
- normalcy
- nozzle
- noodle
- notation
- notch
- note-shaver
- notion
- nutty
- oat
- observation post
- odorless
- off limits
- odor
- off-beat
- off-broadway
- off-line
- offense
- office seeker
- oil
- oleo
- oleomargarine
- one-legged
- one-nighter
- old glory
- only
- open
- open shop
- opening
- operate
- operative