The phrase "most million" can be expressed in a variety of different ways, depending on the context in which it's being used. Some synonyms for "most million" might include "the majority of millions," "the greatest number of millions," or "the vast majority of millions." Other possible options might include "the overwhelming majority of millions" or "the greater part of millions." Of course, the specific phrasing that's appropriate for a given situation will depend on the specific connotations and implications that the speaker or writer wants to convey, as well as the tone and style of the communication.