Excurrent is a term used to describe the growth pattern of a tree in which the branches and trunk continue to grow upward from a central point. There are several synonyms for this word, including upright, erect, ascending, and towering. Other related terms include columnar, cylindrical, and stalwart. These synonyms help to convey a sense of strength and stability, and can be useful in describing the aesthetic and functional qualities of different tree species. Ultimately, the choice of words depends on the context and intended meaning, but a strong vocabulary of synonyms can enhance one's ability to communicate effectively about the natural world.