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There are 19 fourteen-letter words containing EFF

COUNTEREFFORTScounterefforts n. Plural of countereffort.
COUNTEREFFORT n. an effort opposing another effort.
DIEFFENBACHIASdieffenbachias n. Plural of dieffenbachia.
DIEFFENBACHIA n. any plant of the tropical American araceous genus Dieffenbachia, including the dumbcane.
EFFECTUALITIESeffectualities n. Plural of effectuality.
EFFECTUALITY n. the state of being effectual.
EFFEMINATENESSeffeminateness n. Effeminacy.
EFFEMINATENESS n. the state of being effeminate.
EFFERVESCENCESeffervescences n. Plural of effervescence.
EFFERVESCENCE n. boiling or bubbling, also EFFERVESCENCY.
EFFERVESCENTLYeffervescently adv. In an effervescent manner.
EFFERVESCENT adv. frothing, bubbling.
EFFERVESCINGLYeffervescingly adv. With effervescence.
EFFERVESCING adv. EFFERVESCE, to bubble, hiss, and foam as gas escapes.
EFFLORESCENCESefflorescences n. Plural of efflorescence.
EFFLORESCENCE n. the act of developing and unfolding as if coming into flower.
EFFORTLESSNESSeffortlessness n. The state of being effortless; facility.
EFFORTLESS n. showing or requiring little or no effort.
EFFUSIVENESSESeffusivenesses n. Plural of effusiveness.
EFFUSIVENESS n. the state of being effusive.
HYPEREFFICIENThyperefficient adj. Extremely efficient.
HYPEREFFICIENT adj. excessively efficient.
INEFFABILITIESineffabilities n. Plural of ineffability.
INEFFABILITY n. the state of being ineffable.
INEFFECTUALITYineffectuality n. The state or condition of being ineffectual.
INEFFECTUALITY n. the state of being ineffectual.
INEFFICACITIESINEFFICACITY n. lack of power to produce a desired effect, also INEFFICACY.
INEFFICIENCIESinefficiencies n. Plural of inefficiency.
INEFFICIENCY n. the state of being inefficient.
NONEFFECTIVELYSorry, definition not available.
SUPEREFFECTIVEsupereffective adj. Particularly effective.
SUPEREFFECTIVE adj. extremely effective.
SUPEREFFICIENTsuperefficient adj. Very efficient.
SUPEREFFICIENT adj. extremely efficient.
ULTRAEFFICIENTultraefficient adj. Extremely efficient; of utmost efficiency.
ULTRAEFFICIENT adj. extremely efficient.

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: 133 words
  • Scrabble in French: 48 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 49 words
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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