top executive vs tycoon

top executive and tycoon both are nouns.

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

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

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

top executive (noun)	tycoon (noun)
a very wealthy or powerful businessman	a very wealthy or powerful businessman