baron vs man of affairs

baron and man of affairs both are nouns.

Word	Noun	Adjective	Verb	Adverb
baron	Yes	No	No	No
man of affairs	Yes	No	No	No

As nouns, man of affairs is a hypernym of baron; that is, man of affairs is a word with a broader meaning than baron:

baron: a very wealthy or powerful businessman
man of affairs: a person engaged in commercial or industrial business (especially an owner or executive)

Other hypernyms of baron include businessman.

baron (noun)	man of affairs (noun)
a British peer of the lowest rank	a person engaged in commercial or industrial business (especially an owner or executive)
a very wealthy or powerful businessman
a nobleman (in various countries) of varying rank