mop vs dust mop

mop and dust mop both are nouns.

Word	Noun	Adjective	Verb	Adverb
mop	Yes	No	Yes	No
dust mop	Yes	No	No	No

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

mop: cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors
dust mop: a dry swab for dusting floors

Other hyponyms of mop include dry mop, dustmop, sponge mop.

mop (noun)	dust mop (noun)
cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors	a dry swab for dusting floors

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