deadbolt vs safety lock

deadbolt and safety lock both are nouns.

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

As nouns, safety lock is a hyponym of deadbolt; that is, safety lock is a word with a more specific, narrower meaning than deadbolt:

Other hyponyms of deadbolt include safety bolt, slide bolt, sliding bolt.

deadbolt (noun)	safety lock (noun)
the part of a lock that is engaged or withdrawn with a key	guard consisting of a locking device that prevents a weapon from being fired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