The word "evolutionistic" refers to the theory of evolution or the process of gradual development and change. Some synonyms of this word include "evolutionary", "progressive", "developmental", "transformative", "advancing", and "emergent". These words all describe the process of change and growth over time, whether it be in biology, culture, or society. Each word offers a slightly different connotation, but they all convey the idea that things are constantly evolving and advancing. Using synonyms like these can help to make your writing more dynamic and varied, while still conveying the core concept of evolution and change.