There are many synonyms for the word "one side" that can be used to convey the idea of a single, singular, or separate part of something. Some of these synonyms include "one-way," "unilateral," "singular," "solitary," "only," "separate," "distinct," "isolated," and "unidirectional." Each of these synonyms can be used in different contexts to give a slightly different nuance to the meaning of "one side." For example, "unilateral" suggests a decision made by only one party, while "singular" generally refers to something that is unique or individual. Experimenting with different synonyms can help writers find just the right word to express their intended meaning.