desertic soil vs dirt

desertic soil and dirt both are nouns.

Word	Noun	Adjective	Verb	Adverb
desertic soil	Yes	No	No	No
dirt	Yes	Yes	No	No

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

desertic soil: a type of soil that develops in arid climates
dirt: the part of the earth's surface consisting of humus and disintegrated rock

Other hypernyms of desertic soil include soil.

desertic soil (noun)	dirt (noun)
a type of soil that develops in arid climates	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

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