The word "asparagus setaceous" is quite specific, referring to a type of plant that has long, slender leaves similar to the asparagus vegetable. To describe this type of plant using synonyms, one could use words like "needle-like" or "slender-leaved" to convey the plant's shape and texture. Other possible synonyms for "asparagus setaceous" might include "thin-stemmed," "stalky," or "grassy," as these words all describe features of the plant's appearance. Additionally, words like "herbaceous" or "foliage-bearing" could be used to describe the plant's overall nature and habits, highlighting its green, leafy, and vegetative qualities.