cleaning pad vs cleaning device

cleaning pad and cleaning device both are nouns.

Word	Noun	Adjective	Verb	Adverb
cleaning pad	Yes	No	No	No
cleaning device	Yes	No	No	No

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

Other hypernyms of cleaning pad include cleaning equipment, cleaning implement, pad.

cleaning pad (noun)	cleaning device (noun)
a pad used as a cleaning implement	any of a large class of implements used for cleaning