What is a synonym to everything?

There isn't a single perfect synonym for "everything" because it's such a broad and absolute term. However, depending on the context, you could use these:

General:

* All

* Each and every

* Whole

* Entire

* Total

* All things

* Universally

* Everything and anything

More specific:

* All aspects (when referring to different parts of something)

* All facets (similar to aspects)

* Every single thing (emphasizing completeness)

* The entirety (formal, emphasizing comprehensiveness)

The best synonym to use will depend on the specific situation and what you're trying to convey.