top executive vs mogul

top executive and mogul both are nouns.

Word	Noun	Adjective	Verb	Adverb
top executive	Yes	No	No	No
mogul	Yes	No	No	No

As nouns, top executive and mogul are synonyms defined as:

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

top executive (noun)	mogul (noun)
a very wealthy or powerful businessman	a very wealthy or powerful businessman
	a bump on a ski slope