What is another word for primary source?

There isn't one perfect synonym for "primary source," as the term has a specific meaning in academic and historical research. However, here are some alternatives depending on the context:

Similar meaning, but less formal:

* Original source

* First-hand account

* Original document

* Source material

More specific terms:

* Eyewitness testimony (if the source is a personal account)

* Archival material (if the source is from a historical archive)

* Contemporary document (if the source is from the time period being studied)

More general terms:

* Evidence

* Data

* Information

It's important to choose the word that best fits the specific context and the type of primary source you are discussing.