recorder vs black box

recorder and black box both are nouns.

Word	Noun	Adjective	Verb	Adverb
recorder	Yes	No	No	No
black box	Yes	No	No	No

As nouns, black box is a hyponym of recorder; that is, black box is a word with a more specific, narrower meaning than recorder:

recorder: equipment for making records
black box: equipment that records information about the performance of an aircraft during flight

recorder (noun)	black box (noun)
a tubular wind instrument with 8 finger holes and a fipple mouthpiece	equipment that records information about the performance of an aircraft during flight
equipment for making records
someone responsible for keeping records
a barrister or solicitor who serves as part-time judge in towns or boroughs