Unbrako key vs hex key

Unbrako key and hex key both are nouns.

Word	Noun	Adjective	Verb	Adverb
Unbrako key	Yes	No	No	No
hex key	Yes	No	No	No

As nouns, Unbrako key and hex key are synonyms defined as:

Other synonyms of Unbrako key include Allen key, Inbus key, Inbus wrench, Unbrako wrench, zeta key, zeta wrench.

Unbrako key (noun)	hex key (noun)
a wrench for Allen screws	a wrench for Allen screws