There are a variety of synonyms that can be used interchangeably with the word "preluder." Some alternative options include "introducer," "precursor," "forerunner," and "harbinger." Each of these words captures the notion of something that comes before or in advance of a larger or more significant event or occurrence. Other synonyms for "preluder" include "prologue," "curtain-raiser," and "overture," which specifically suggest an opening act or prelude to a performance or presentation. Regardless of the specific word choice, all of these synonyms carry the connotation of something that is early, preliminary, or introductory in nature.