When it comes to describing something as tall and narrow, "columnar" is the word that often comes to mind. However, there are various synonyms that one can use to describe something as "more columnar." For instance, the term "cylindrical" is a great alternative to describe something that is both tall and tube-shaped. Additionally, "towering" and "spire-like" can be used to capture a sense of height in an object. For more subtle variations, "rectangular," "tall and slender," and "vertical" can also be used to describe something as columnar without being overly specific about its dimensions. Ultimately, the choice of synonym will depend on the context in which it's used and the nuances that need to be conveyed.