safety fuse vs breaker

safety fuse and breaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
safety fuse	Yes	No	No	No
breaker	Yes	No	No	No

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

safety fuse: an electrical device that can interrupt the flow of electrical current when it is overloaded
breaker: a device that trips like a switch and opens the circuit when overloaded

Other hyponyms of safety fuse include cartridge fuse, circuit breaker, plug fuse.

safety fuse (noun)	breaker (noun)
a slow-burning fuse consisting of a tube or cord filled or saturated with combustible matter; used to ignite detonators from a distance	a device that trips like a switch and opens the circuit when overloaded
an electrical device that can interrupt the flow of electrical current when it is overloaded	waves breaking on the shore
	a quarry worker who splits off blocks of stone