cleaning device vs mop

cleaning device and mop both are nouns.

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

As nouns, mop is a hyponym of cleaning device; that is, mop is a word with a more specific, narrower meaning than cleaning device:

cleaning device: any of a large class of implements used for cleaning
mop: cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors

Other hyponyms of cleaning device include broom, carpet sweeper, sweeper, cleaning pad, pipe cleaner, pull-through, squeegee, swab, swob.

cleaning device (noun)	mop (noun)
any of a large class of implements used for cleaning	cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors

cleaning device (verb)	mop (verb)
	make a sad face and thrust out one's lower lip
	to wash or wipe with or as if with a mop