safety lock vs safety catch

safety lock and safety catch both are nouns.

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

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

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

safety lock (noun)	safety catch (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