sedimentary clay vs dirt

sedimentary clay and dirt both are nouns.

Word	Noun	Adjective	Verb	Adverb
sedimentary clay	Yes	No	No	No
dirt	Yes	Yes	No	No

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

sedimentary clay: clay soil formed by sedimentary deposits
dirt: the part of the earth's surface consisting of humus and disintegrated rock

Other hypernyms of sedimentary clay include soil.

sedimentary clay (noun)	dirt (noun)
clay soil formed by sedimentary deposits	disgraceful gossip about the private lives of other people
	anything regarded as making something unclean
	the part of the earth's surface consisting of humus and disintegrated rock
	obscene terms for feces

sedimentary clay (adjective)	dirt (adjective)
	(of roads) not leveled or drained; unsuitable for all year travel