plug, bolt, cork, bung, stopper
栓 centers on a device that closes an opening tightly: a plug, stopper, cork, or bolt that seals a container or pipe.
栓 combines 木 (wood) with 全, which likely contributes the sound and the idea of completeness or wholeness, suggesting a wooden piece that completely closes an opening.
A wooden 木 piece that makes a complete 全 seal: a plug or stopper.
For セン, imagine a wooden plug that costs one cent: cent -> セン, and it seals the bottle completely.
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stopper; cork; plug; bung
thrombus; blood clot
embolus; abnormal substance (i.e. air) circulating in the blood
fire hydrant
stopcock (gas, water); main valve; main tap; stop tap
gas tap; gas cock
cork stopper; (bottle) cork
rubber stopper; rubber plug
occurrence of deep vein thrombosis in air travelers
freeze protection valve
inner plug (bottle, etc.)
communal tap
common faucet
stopper
coronary thrombosis
embolism
stopping tightly; sealing hermetically
connector; plug
sillcock; hose cock
air travel thrombosis; ATT