Affecter is a French word that means "to affect" or "to influence." In English, there are several synonyms for affecter that can be used to convey similar meaning. One possible synonym is "influence." When something affects you, it influences how you feel or behave. Another synonym for affecter is "impact." The impact of an event or situation can affect your emotions and actions. Additionally, "alter" and "change" can be used as synonyms for affecter. These words imply that something has been influenced in a way that has caused a noticeable change or alteration. Finally, "transform" is another possible synonym for affecter, suggesting a more profound and lasting change.