safety lock vs deadbolt

safety lock and deadbolt both are nouns.

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

As nouns, deadbolt is a hypernym of safety lock; that is, deadbolt is a word with a broader meaning than safety lock:

Other hypernyms of safety lock include bolt.

safety lock (noun)	deadbolt (noun)
guard consisting of a locking device that prevents a weapon from being fired	the part of a lock that is engaged or withdrawn with a key
a bolt that cannot be moved from outside the door or gate