safety catch vs safety lock

safety catch and safety lock both are nouns.

Word	Noun	Adjective	Verb	Adverb
safety catch	Yes	No	No	No
safety lock	Yes	No	No	No

As nouns, safety catch and safety lock are synonyms defined as:

safety catch and safety lock: guard consisting of a locking device that prevents a weapon from being fired

safety catch (noun)	safety lock (noun)
guard consisting of a locking device that prevents a weapon from being fired	guard consisting of a locking device that prevents a weapon from being fired
	a bolt that cannot be moved from outside the door or gate