horizon vs visible horizon

horizon and visible horizon both are nouns.

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

As nouns, horizon and visible horizon are synonyms defined as:

horizon and visible horizon: the line at which the sky and Earth appear to meet

Other synonyms of horizon include apparent horizon, sensible horizon, skyline.

horizon (noun)	visible horizon (noun)
the range of interest or activity that can be anticipated	the line at which the sky and Earth appear to meet
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