Millions, a term used to describe a very large number, can be replaced with a variety of synonyms. Some common alternatives include "numerous", "countless", "multitude", "plenty", or "umpteen". Other options include "innumerable", "myriad", "copious", "a slew of", or "tons of". When referring specifically to a large sum of money, synonyms such as "fortune", "billions", "exorbitant amount", or "heaps" can be used. No matter the context, there are an endless amount of words that can be used to replace the word millions for added variety and clarity in writing or conversation.