The phrase "six times" can be replaced by several synonyms depending on the context. Some of the common synonyms include "sixfold," "six-fold," "six multiples of," "six instances of," "six repetitions of," and "six occurrences of." These synonyms can be useful in writing or speaking about a quantity that is repeated six times or expressed as a multiple of six. For example, instead of saying "I have seen the movie six times," you could say "I have watched the movie six instances of." Using synonyms can help elevate your vocabulary and make your writing or speech more interesting and varied.