breaker vs circuit breaker

breaker and circuit breaker both are nouns.

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

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

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

breaker (noun)	circuit 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