Niobian is a term that is derived from the element niobium, which is known for its strength and durability. Synonyms for niobian could include metallic, alloyed, and robust. Other words that could be used to describe something that is niobian or has similar qualities include sturdy, tough, resilient, and enduring. These descriptors could apply to a range of materials or objects, from construction materials to industrial equipment to personal protective gear. In addition, niobium is often used in alloy form for advanced technology applications, so synonyms for niobian could also encompass terms related to innovation and high-tech manufacturing.