Existing side by side can be described using a variety of synonyms that convey the same meaning in different ways. Some possible alternatives include coexisting, colliding, intermingling, overlapping, coinciding, and companionable. Coexisting refers to two or more entities living or existing in the same place or at the same time. Colliding implies a degree of tension or conflict between two things that occupy the same space. Intermingling suggests a blending or mixing of different elements or cultures. Overlapping describes two or more things that share a common area or overlap in terms of time or place. Coinciding refers to things that happen or exist at the same time or in the same way. Companionable conveys a more positive connotation, suggesting that two things exist together in a friendly or harmonious manner.