What is a different word with the same meaning for things?

It depends on the context! "Things" can mean many different things. Here are some alternatives depending on the context:

General Objects:

* Items

* Objects

* Possessions

* Stuff

* Materials

* Goods

Abstract Concepts:

* Matters

* Circumstances

* Events

* Occurrences

* Phenomena

Actions or Activities:

* Acts

* Activities

* Events

* Tasks

To give you the best word, I need more context. Could you tell me what you are referring to?