bleaching clay vs clay

bleaching clay and clay both are nouns.

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

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

Other hypernyms of bleaching clay include mud.

bleaching clay (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