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List of 12-letter words ending with

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There are 14 twelve-letter words ending with NIUMS

CALIFORNIUMSCALIFORNIUM n. a synthetic element produced in trace quantities by helium isotope bombardment of curium.
CONDOMINIUMScondominiums n. Plural of condominium.
CONDOMINIUM n. (US) a block of apartments in which each apartment is separately owned.
EINSTEINIUMSEINSTEINIUM n. a radioactive element produced artificially.
ERYTHRONIUMSERYTHRONIUM n. any plant of the bulbous genus Erythronium, with decoratively mottled leaves and cyclamen-like flowers.
HYDROXONIUMShydroxoniums n. Plural of hydroxonium.
HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water.
PANDEMONIUMSpandemoniums n. Plural of pandemonium.
PANDEMONIUM n. riotous uproar, also PANDAEMONIUM.
PELARGONIUMSpelargoniums n. Plural of pelargonium.
PELARGONIUM n. a kind of geranium.
PERICRANIUMSpericraniums n. Plural of pericranium.
PERICRANIUM n. a membrane covering the skull.
PHOSPHONIUMSphosphoniums n. Plural of phosphonium.
PHOSPHONIUM n. the radical PH4, analogous to ammonium.
POSITRONIUMSpositroniums n. Plural of positronium.
POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom.
POSTSCENIUMSPOSTSCENIUM n. the part of the stage behind the scenery.
QUADRENNIUMSquadrenniums n. Plural of quadrennium.
QUADRENNIUM n. (Latin) a period of four years, also QUADRIENNIUM.
ROENTGENIUMSROENTGENIUM n. a short-lived radioactive element produced artificially.
TRIDOMINIUMStridominiums 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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See this list for:

  • English Wiktionary: 33 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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