To convey the concept of something being on the same plane or altitude, there are plenty of synonyms to use instead of the phrase "was level". These synonyms include: even, flush, flat, parallel, aligned, uniform, horizontal, plain, smooth, seamless, and straight. Moreover, these words can be used to describe various things, such as a surface, floor, landscape, or horizon. By using different synonyms for "was level", you can add more detail and nuance to your writing, capturing a range of degrees of levelness and creating a clearer picture in the reader's mind.