escape valve vs escape cock

escape valve and escape cock both are nouns.

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

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

escape valve and escape cock: 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 valve include escape, relief valve, safety valve.

escape valve (noun)	escape cock (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