While the term "plankton" is a general term, it encompasses a wide range of organisms that are unable to swim against currents and therefore drift along with the water. This includes both plant plankton (phytoplankton) and animal plankton (zooplankton).

Here are some specific terms that you might encounter:

* Phytoplankton: These are microscopic plants that form the base of the food chain in aquatic environments.

* Zooplankton: These are microscopic animals that feed on phytoplankton and other zooplankton.

* Nekton: These are larger organisms that can swim against currents, like fish and whales.

So while "plankton" is the most general term, it's important to note that there are different types of organisms that float on water.