soil horizon vs horizon

soil horizon and horizon both are nouns.

Word	Noun	Adjective	Verb	Adverb
soil horizon	Yes	No	No	No
horizon	Yes	No	No	No

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

soil horizon: a layer in a soil profile
horizon: a specific layer or stratum of soil or subsoil in a vertical cross section of land

soil horizon (noun)	horizon (noun)
a layer in a soil profile	the range of interest or activity that can be anticipated
	the line at which the sky and Earth appear to meet
	a specific layer or stratum of soil or subsoil in a vertical cross section of land
	the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth