pipeclay vs clay

pipeclay and clay both are nouns.

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

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

pipeclay: fine white clay used in making tobacco pipes and pottery and in whitening leather
clay: a very fine-grained soil that is plastic when moist but hard when fired

pipeclay (noun)	clay (noun)
fine white clay used in making tobacco pipes and pottery and in whitening leather	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