Flue, Fluff, Foam, Foul, Froth, Fuzz, Gag, Gossamer, Hat, Hold, Hood, Impound, Inhibit, Ink, Jam, Keep, Kill, Lid, Maintain, Mew, Murk, Muzzle, Obstruct, Pack, Peel, Peeling, Peg, Pen, Pin, Plug, Pontoon, Pound, Preserve, Quash, Quell, Quench, Raft, Repress, Restrain, Restrict, Retain, Rind, Roof, Save, Shackle, Shade, Shadow, Silence, Skin, Smash, Smoke, Smother, Smudge, Smut, Soot, Spigot, Spike, Spill, Sponge, Spume, Squash, Squelch, Stay, Stench, Stifle, Stop, Stopgap, Stopper, Strangle, Straw, Stuff, Stultify, Subdue, Suffocate, Suppress, Surfboard, Tap, Air, Asphyxiate, Balsa, Bar, Bark, Besmirch, Bind, Black, Blacken, Block, Blockade, Blot, Blotch, Bob, Bonnet, Boom, Bubble, Bung, Buoy, Cage, Cap, Censor, Chaff, Charcoal, Check, Chink, Chip, Choke, Clog, Cloister, Cobweb, Cock, Confine, Congest, Constrain, Coop, Cortex, Cover, Crib, Crown, Crush, Dam, Darken, Denigrate, Detain, Dome, Down, Drown, Dust, Encage, Enclose, Epicarp, Ether, Extinguish, Fairy, Faucet, Feather, Fill, Float, Throttle, Tip, Top, Valve