parking brake vs hand brake

parking brake and hand brake both are nouns.

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

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

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

Other synonyms of parking brake include emergency, emergency brake.

parking 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