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There are 4 seven-letter words containing NIOB

NIOBATEniobate n. (Chemistry) Any salt, XNbO3, of the weak niobic acid.
niobate n. (Chemistry) The univalent anion NbO3-.
NIOBATE n. a salt of niobium.
NIOBITEniobite n. The mineral columbite.
NIOBITE n. the chief ore of niobium, aka columbite.
NIOBIUMniobium n. A chemical element (symbol Nb) with an atomic number of 41: a light grey, crystalline, ductile transition…
niobium n. (Countable) A single atom of this element.
NIOBIUM n. a metallic element, formerly called columbium.
NIOBOUSniobous adj. (Archaic) Of or pertaining to niobium.
NIOBOUS adj. containing niobium with a valency of less than five.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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