horizon vs ambit

horizon and ambit both are nouns.

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

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

Other hypernyms of horizon include compass, orbit, range, reach, scope.

horizon (noun)	ambit (noun)
the range of interest or activity that can be anticipated	an area in which something acts or operates or has power or control:
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