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There are 16 words ending with ACTIVITY

ACTIVITY	• activity n. (Uncountable) The state or quality of being active; activeness. • activity n. (Countable) Something done as an action or a movement. • activity n. (Countable) Something done for pleasure or entertainment, especially one involving movement or an excursion.
COACTIVITY	• coactivity n. Acting together or in concert; unity of action. • COACTIVITY n. unity of action.
INACTIVITY	• inactivity n. The quality of being inactive; idleness; passiveness. • INACTIVITY n. the state of being inactive.
REACTIVITY	• reactivity n. Responsiveness to stimulation. • reactivity n. (Chemistry) relative susceptibility to chemical reaction. • REACTIVITY n. the state of being reactive.
BIOACTIVITY	• bioactivity n. (Biology, medicine) Biologic activity, such as biochemical or immunologic reactivity: the biologic effect… • BIOACTIVITY n. the state of being bioactive.
OVERACTIVITY	• overactivity n. Excessive activity. • OVERACTIVITY n. excessive activity.
REFRACTIVITY	• refractivity n. The quality or degree of being refractive. • REFRACTIVITY n. the state of being refractive.
VASOACTIVITY	• vasoactivity n. The quality or degree of being vasoactive. • VASOACTIVITY n. the state of being vasoactive.
HYPERACTIVITY	• hyperactivity n. The quality of being hyperactive; excessive and pathological movement and restlessness. • HYPERACTIVITY n. the state of being excessively or pathologically active.
INTERACTIVITY	• interactivity n. The quality of being interactive. • INTERACTIVITY n. the state of being interactive.
RADIOACTIVITY	• radioactivity n. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from… • radioactivity n. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc. • RADIOACTIVITY n. the spontaneous decay of the nucleus of an element.
RETROACTIVITY	• retroactivity n. The state or characteristic of being retroactive. • retroactivity n. (Law) The application of a law to events that took place before it was made. • RETROACTIVITY n. the state of being retroactive.
SUPERACTIVITY	• superactivity n. A state of heightened or excessive activity. • superactivity n. A scout group activity involving adventure away from home. • SUPERACTIVITY n. the state of being superactive.
UNDERACTIVITY	• underactivity n. Insufficient activity. • UNDERACTIVITY n. the state of being underactive.
ELECTROACTIVITY	• electroactivity n. Quality or degree of being electroactive. • ELECTROACTIVITY n. the state of being electroactive.
HYPERREACTIVITY	• hyperreactivity n. (Uncountable) The condition of being hyperreactive. • hyperreactivity n. (Countable) An allergic response to a very low dose of irritant. • HYPERREACTIVITY n. the state of being hyperreactive.

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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English Wiktionary: 88 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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