hand brake vs emergency brake

hand brake and emergency brake both are nouns.

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

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

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

Other synonyms of hand brake include emergency, parking brake.

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