escape cock vs safety valve

escape cock and safety valve both are nouns.

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

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

escape cock and safety 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, escape valve, relief valve.

escape cock (noun)	safety 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