"Turns into" is a commonly used phrase that describes a transformation or a change from one form to another. However, there are a variety of synonyms that can be used in its place, depending on the context of the sentence. Some options include "transforms into," "becomes," "morphs into," "evolves into," "changes into," and "converts into." Each of these phrases conveys a slightly different nuance and should be chosen based on the meaning that the author wants to convey. Using different synonyms for "turns into" can help add variety and interest to a piece of writing.