
1) Cock 2) Faucet 3) Faucet with a rotating plug 4) Turncock 5) Valve on a pipe
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https://www.crosswordclues.com/clue/stopcock

1) Stopper 2) Valve
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https://www.crosswordclues.com/clue/stopcock

A stopcock is a valve used to restrict or isolate the flow of a liquid or gas through a pipe. In the United Kingdom a stopcock, not to be confused with a gate valve, is used to prevent flow of water into a domestic water system. There are usually two stopcocks for a home. One is usually found just outside the property boundary and can be used to i...
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http://en.wikipedia.org/wiki/Stopcock

• (n.) A bib, faucet, or short pipe, fitted with a turning stopper or plug for permitting or restraining the flow of a liquid or gas; a cock or valve for checking or regulating the flow of water, gas, etc., through or from a pipe, etc. • (n.) The turning plug, stopper, or spigot of a faucet.
Found on
http://thinkexist.com/dictionary/meaning/stopcock/

More commonly called a Stop Valve. A valve that is used for regulating water flow.
Found on
http://www.encyclo.co.uk/local/20844

(stop´kok) a valve that regulates the flow of fluid through a tube.
Found on
http://www.encyclo.co.uk/local/21001

Main tap for turning off the mains water or gas.
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http://www.encyclo.co.uk/visitor-contributions.php
Stop'cock` noun 1. A bib, faucet, or short pipe, fitted with a turning stopper or plug for permitting or restraining the flow of a liquid or gas; a cock or valve for checking or regulating the flow of water, gas, etc., through or from a pipe, etc.
2. The turning plug, stopper, or spigot ...
Found on
http://www.encyclo.co.uk/webster/S/203

[
n] - faucet consisting of a rotating device for regulating flow of a liquid
Found on
http://www.webdictionary.co.uk/definition.php?query=stopcock
cock noun faucet consisting of a rotating device for regulating flow of a liquid
Found on
https://www.encyclo.co.uk/local/20974

cock (def. 3).
Found on
https://www.infoplease.com/dictionary/stopcock
No exact match found.