What does the suffix naut mean?

The suffix "naut" comes from the Greek word ναύτης (naútēs), which means "sailor" or "navigator". It's often used to describe someone who travels or explores in a particular way, usually involving a specific mode of transportation.

Here are some examples:

* Astronaut: Someone who travels in space.

* Cosmonaut: A Russian astronaut.

* Taikonaut: A Chinese astronaut.

* Aquanaut: Someone who explores underwater, especially in a submersible.

* Cynaut: A hypothetical future explorer of cyberspace.

So, whenever you see "naut" at the end of a word, it usually indicates someone who explores or travels in a specific environment or using a specific mode of transport.