horizon vs skyline

horizon and skyline both are nouns.

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

As nouns, horizon and skyline are synonyms defined as:

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

horizon (noun)	skyline (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	the outline of objects seen against the sky
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