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There are 14 twelve-letter words containing NIUMS

CALIFORNIUMS	• CALIFORNIUM n. a synthetic element produced in trace quantities by helium isotope bombardment of curium.
CONDOMINIUMS	• condominiums n. Plural of condominium. • CONDOMINIUM n. (US) a block of apartments in which each apartment is separately owned.
EINSTEINIUMS	• EINSTEINIUM n. a radioactive element produced artificially.
ERYTHRONIUMS	• ERYTHRONIUM n. any plant of the bulbous genus Erythronium, with decoratively mottled leaves and cyclamen-like flowers.
HYDROXONIUMS	• hydroxoniums n. Plural of hydroxonium. • HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water.
PANDEMONIUMS	• pandemoniums n. Plural of pandemonium. • PANDEMONIUM n. riotous uproar, also PANDAEMONIUM.
PELARGONIUMS	• pelargoniums n. Plural of pelargonium. • PELARGONIUM n. a kind of geranium.
PERICRANIUMS	• pericraniums n. Plural of pericranium. • PERICRANIUM n. a membrane covering the skull.
PHOSPHONIUMS	• phosphoniums n. Plural of phosphonium. • PHOSPHONIUM n. the radical PH4, analogous to ammonium.
POSITRONIUMS	• positroniums n. Plural of positronium. • POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom.
POSTSCENIUMS	• POSTSCENIUM n. the part of the stage behind the scenery.
QUADRENNIUMS	• quadrenniums n. Plural of quadrennium. • QUADRENNIUM n. (Latin) a period of four years, also QUADRIENNIUM.
ROENTGENIUMS	• ROENTGENIUM n. a short-lived radioactive element produced artificially.
TRIDOMINIUMS	• tridominiums n. Plural of tridominium. • TRIDOMINIUM n. (Latin) threefold rule.

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 1Word.ws and WikWik.org.

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English Wiktionary: 34 words
Scrabble in French: 8 words
Scrabble in Spanish: 1 word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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