top executive vs business leader

top executive and business leader both are nouns.

Word	Noun	Adjective	Verb	Adverb
top executive	Yes	No	No	No
business leader	Yes	No	No	No

As nouns, top executive and business leader are synonyms defined as:

top executive and business leader: a very wealthy or powerful businessman

Other synonyms of top executive include baron, big businessman, king, magnate, mogul, power, tycoon.

top executive (noun)	business leader (noun)
a very wealthy or powerful businessman	a very wealthy or powerful businessman