"A world of" is a commonly used phrase that means a great deal or large quantity of something. When looking for synonyms for this phrase, there are many possibilities. "A plethora of" is a great option and can be used to describe a large quantity of something. Another possibility is "an abundance of," which means a great supply or fullness of something. "A wealth of" can also be used if referring to something that holds significant value. Other synonyms include "a profusion of," "a cornucopia of," and "a tidal wave of." All of these phrases can be used interchangeably with "a world of" to describe a significant amount of something.