scouring vs mopping

scouring and mopping both are nouns.

Word	Noun	Adjective	Verb	Adverb
scouring	Yes	No	No	No
mopping	Yes	No	No	No

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

scouring: the act of cleaning a surface by rubbing it with a brush and soap and water
mopping: cleaning with a mop

Other hyponyms of scouring include swabbing.

scouring (noun)	mopping (noun)
the act of cleaning a surface by rubbing it with a brush and soap and water	cleaning with a mop
moving over territory to search for something