emergency brake vs hand brake

emergency brake and hand brake both are nouns.

Word	Noun	Adjective	Verb	Adverb
emergency brake	Yes	No	No	No
hand brake	Yes	No	No	No

As nouns, emergency brake and hand brake are synonyms defined as:

emergency brake and hand brake: a brake operated by hand; usually operates by mechanical linkage

Other synonyms of emergency brake include emergency, parking brake.

emergency brake (noun)	hand brake (noun)
a brake operated by hand; usually operates by mechanical linkage	a brake operated by hand; usually operates by mechanical linkage