When you want to describe the action of placing two things side by side, there are a number of synonyms you can use to make your writing more vivid and dynamic. Some examples of alternative expressions for "putting side by side" include juxtapose, compare, contrast, align, position, arrange, set in parallel, parallelize, arrange side by side, line up, and match up. Each of these words conveys a slightly different connotation and nuance, so choosing the right synonym is important to accurately reflect the context and tone of your writing. Experiment with different synonyms for "put side by side" to add variety and interest to your language.