from where does this word photosynthesis arrived?

The word comes from the Greek φώτο- (photo-), "light," and σύνθεσις (synthesis), "placing with."

Photosynthesis is a process that converts light energy into chemical energy . Its initial substrates are carbon dioxide and water; the energy source is sunlight (electromagnetic radiation); and the end-products are oxygen and (energy-containing) carbohydrates, such as sucrose, glucose or starch.