escape cock vs escape valve

escape cock and escape valve both are nouns.

Word	Noun	Adjective	Verb	Adverb
escape cock	Yes	No	No	No
escape valve	Yes	No	No	No

As nouns, escape cock and escape valve are synonyms defined as:

escape cock and escape valve: a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level

Other synonyms of escape cock include escape, relief valve, safety valve.

escape cock (noun)	escape valve (noun)
a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level	a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level