Evidentiate is a rarely used and somewhat obscure term, and as such, it can be difficult to come up with synonyms that are frequently used in everyday language. Some possible alternatives might include: demonstrate, show, illustrate, prove, indicate, reveal, display, manifest, or make apparent. All of these terms convey the idea of making something clear or visible, and they are likely to be more familiar to most readers. When choosing a synonym, it's important to consider the context in which it will be used and to select a word that fits the tone and style of the writing.