dust mop vs mop

dust mop and mop both are nouns.

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

As nouns, mop is a hypernym of dust mop; that is, mop is a word with a broader meaning than dust mop:

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

Other hypernyms of dust mop include swab, swob.

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

dust mop (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