mop vs sponge mop

mop and sponge mop both are nouns.

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

As nouns, sponge mop is a hyponym of mop; that is, sponge 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
sponge mop: a wet mop with a sponge as the absorbent

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

mop (noun)	sponge mop (noun)
cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors	a wet mop with a sponge as the absorbent

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