What is an antonym for archaeologist?

There isn't a perfect antonym for "archaeologist" in the sense of a single word with the opposite meaning. However, depending on the context, you could use words like:

* Historian: While archaeologists study the past through physical remains, historians focus on written records.

* Futureologist: This is a playful term for someone who studies the future. It's not a real profession.

* Demolisher: This word implies someone who destroys things, the opposite of an archaeologist who preserves them.

* Builder: This is an antonym in terms of action, as a builder creates new structures while an archaeologist uncovers old ones.

The best word to use depends on the specific context and what aspect of an archaeologist's work you want to oppose.