| Answer | Crossword Clue |
|---|---|
| niobiums | NIOBIUM, a metallic element |
| niobic | pertaining to niobium (a metallic element) |
| niobous | pertaining to niobium (a metallic element) |
| tantalums | gray, hard, rare, metallic element occurring in columbite and tantalite and usually associated with niobium: used, because of its resistance to corrosion by most acids, for chemical, dental, and surgical instruments and apparatus. Symbol: Ta; at |
| columbium | a rare element of the vanadium group, now more commonly called niobium |
| columbiums | COLUMBIUM, a rare element of the vanadium group, now more commonly called niobium |
