sponge mop vs mop

sponge mop and mop both are nouns.

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

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

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

Other hypernyms of sponge mop include swab, swob.

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

sponge 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