Finding appropriate synonyms for the word "was compatible" can be a bit challenging. There are different phrases and expressions that could be used depending on the context and tone of the message. Some potential options include "matched well," "worked harmoniously together," "aligned perfectly," "complemented each other," "fit seamlessly," "jived with," "coexisted smoothly," "synergized effectively," "blended nicely," and "combined effortlessly." It is crucial to choose the right synonym that suits the particular need as this could help enhance the clarity, flow, and impact of the message or document.