Tycoon, magnate (5)
I believe this is a double definition.
'tycoon' is the first definition.
(both can mean a rich person)
'magnate' is the second definition.
(I know that magnate can be written as mogul)
(Other definitions for mogul that I've seen before include "Powerful businessman" , "Powerful businessperson" , "Important person - ski slope bump" , "Indian emperor - important person" , "big shot" .)
I believe this is a double definition.
'tycoon' is the first definition.
(thesaurus)
'magnate' is the second definition.
(I've seen this in another clue)
(Other definitions for nabob that I've seen before include "very wealthy man" , "Powerful man" , "Wealthy influential person" , "he may be loaded" , "Wealthy and powerful person" .)