circuit breaker vs breaker

circuit breaker and breaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
circuit breaker	Yes	No	No	No
breaker	Yes	No	No	No

As nouns, circuit breaker and breaker are synonyms defined as:

circuit breaker and breaker: a device that trips like a switch and opens the circuit when overloaded

circuit breaker (noun)	breaker (noun)
a device that trips like a switch and opens the circuit when overloaded	a device that trips like a switch and opens the circuit when overloaded
	waves breaking on the shore
	a quarry worker who splits off blocks of stone