A scientist is a person who studies the natural world and uses scientific methods to gain knowledge about it. Scientists can work in a variety of fields, including biology, chemistry, physics, geology, and engineering.

A biologist is a scientist who studies living things and their relationship to the environment. Biologists study a wide range of topics, including the structure and function of cells, the genetics of organisms, the evolution of species, and the interactions between organisms and their environment.

So, the main difference between a biologist and a scientist is that biologists specifically study living things, while scientists can study any aspect of the natural world. However, it is important to note that there is some overlap between the two fields. For example, some biologists may also work in fields such as chemistry or physics, while some scientists may also study living things.