"I. P. Morgan" is mostly known as a proper name and a historical figure in the world of finance. As such, there are not a lot of synonyms for the term "I. P. Morgan". However, some people might refer to him using his full name, "John Pierpont Morgan". Additionally, since Morgan was a prominent banker and financier during the late 19th and early 20th centuries, some might refer to him as a tycoon, magnate, or baron of industry. Others might use the term "financier" or "banker" to describe him. Ultimately, there are few exact synonyms for "I. P. Morgan", but there are many related terms used to characterize his life and work.