Unbrako key vs Allen key

Unbrako key and Allen key both are nouns.

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

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

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

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