mud vs bleaching earth

mud and bleaching earth both are nouns.

Word	Noun	Adjective	Verb	Adverb
mud	Yes	No	Yes	No
bleaching earth	Yes	No	No	No

As nouns, bleaching earth is a hyponym of mud; that is, bleaching earth is a word with a more specific, narrower meaning than mud:

Other hyponyms of mud include bleaching clay, mud pie, mire, slop.

mud (noun)	bleaching earth (noun)
slanderous remarks or charges	an adsorbent clay that will remove coloring from oils
water soaked soil; soft wet earth

mud (verb)	bleaching earth (verb)
soil with mud, muck, or mire
plaster with mud