Synthesists are people who make new things by combining different things together.
Being a synthesist is usually seen as a good thing because it means you are creative and can make new and interesting things.
Examples:
The synthesists combined different colors to make a beautiful painting.
She is a great synthesist, she can make new songs from old ones.
The synthesists at the company work together to make new products.
The synthesists mixed different flavors to make a new kind of ice cream.
The synthesists combined metal and wood to make a strong table.
The synthesists made a new kind of computer that can do many things at once.