bleaching earth vs clay

bleaching earth and clay both are nouns.

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

As nouns, clay is a hypernym of bleaching earth; that is, clay is a word with a broader meaning than bleaching earth:

Other hypernyms of bleaching earth include mud.

bleaching earth (noun)	clay (noun)
an adsorbent clay that will remove coloring from oils	the dead body of a human being
	a very fine-grained soil that is plastic when moist but hard when fired
	water soaked soil; soft wet earth