gunlock vs firing mechanism

gunlock and firing mechanism both are nouns.

Word	Noun	Adjective	Verb	Adverb
gunlock	Yes	No	No	No
firing mechanism	Yes	No	No	No

As nouns, gunlock and firing mechanism are synonyms defined as:

gunlock and firing mechanism: the action that ignites the charge in a firearm

gunlock (noun)	firing mechanism (noun)
the action that ignites the charge in a firearm	the action that ignites the charge in a firearm