business leader vs top executive

business leader and top executive both are nouns.

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

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

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

Other synonyms of business leader include baron, big businessman, king, magnate, mogul, power, tycoon.

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