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There are 12 seven-letter words containing NIU

CONIUMS• coniums n. Plural of conium.
• CONIUM n. (Latin) a genus of biennial, poisonous, white-flowered, umbelliferous plants, bearing ribbed fruit and decompound leaves.
CRANIUM• cranium n. (Anatomy) That part of the skull consisting of the bones enclosing the brain, but not including the…
• cranium n. (Anthropology, informal) The upper portion of the skull, including the neurocranium and facial bones…
• cranium n. (Informal) Synonym of skull.
DUBNIUM• dubnium n. A transuranic chemical element (symbol Db) with atomic number 105.
• dubnium n. (Chemistry, obsolete) A rejected name for rutherfordium.
• DUBNIUM n. an element produced by bombarding plutonium with high energy neon ions.
HAFNIUM• hafnium n. A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal.
• HAFNIUM n. a metallic element.
HAHNIUM• hahnium n. (Chemistry, obsolete) A rejected name for dubnium.
• hahnium n. (Chemistry, obsolete) A rejected name for hassium.
• HAHNIUM n. an artificially produced transuranic element.
IONIUMS• IONIUM n. a radioactive isotope of thorium.
MINIUMS• miniums n. Plural of minium.
• MINIUM n. (Latin) a red pigment.
MUONIUM• muonium n. (Physics, chemistry) An exotic atom formed when a positively charged muon (an anti-muon) and an electron…
• MUONIUM n. an electron and a positive muon bound together.
OMNIUMS• omniums n. Plural of omnium.
• OMNIUM n. (Latin) the aggregate value of the different stocks in which a loan to government is now usually funded.
OXONIUM• oxonium n. (Inorganic chemistry) Any univalent oxygen cation derived from water, the simplest of which is the hydronium…
• OXONIUM n. a certain grouping of oxygen and hydrogen atoms.
RHENIUM• rhenium n. A metallic chemical element (symbol Re) with an atomic number of 75: a heavy, silvery-gray transition metal.
• rhenium n. (Countable) A single atom of this element.
• RHENIUM n. a metallic element.
URANIUM• uranium n. The element with atomic number 92 and symbol U: a radioactive silvery-grey metal in the actinide series.
• URANIUM n. a radioactive element, also URANIDE.

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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