recording vs memory device

recording and memory device both are nouns.

Word	Noun	Adjective	Verb	Adverb
recording	Yes	No	No	No
memory device	Yes	No	No	No

As nouns, memory device is a hypernym of recording; that is, memory device is a word with a broader meaning than recording:

recording: a storage device on which information (sounds or images) have been recorded
memory device: a device that preserves information for retrieval

Other hypernyms of recording include storage device.

recording (noun)	memory device (noun)
the act of making a record (especially an audio record)	a device that preserves information for retrieval
a signal that encodes something (e.g., picture or sound) that has been recorded
a storage device on which information (sounds or images) have been recorded