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There are 17 twelve-letter words containing TACT

CONTACTUALLY	• CONTACTUAL adv. relating to contact.
HETEROTACTIC	• heterotactic adj. Of or pertaining to heterotaxis. • heterotactic adj. (Chemistry, of a polymer) Having substituents arranged in a random configuration in each repeat unit. • HETEROTACTIC adj. abnormally arranged.
INTACTNESSES	• intactnesses n. Plural of intactness. • INTACTNESS n. the state of being intact.
PARATACTICAL	• paratactical adj. Synonym of paratactic. • PARATACTICAL adj. of pertaining to, or characterized by, parataxis, also PARATACTIC.
PHONOTACTICS	• phonotactics n. (Linguistics, phonology) A branch of phonology that deals with the restrictions a language applies to… • PHONOTACTICS n. the area of phonology concerned with the analysis and description of the permitted sound sequences of a language.
PHYLLOTACTIC	• phyllotactic adj. Of or pertaining to phyllotaxy. • PHYLLOTACTIC adj. of or relating to phyllotaxis, the arrangement of leaves on the stem, also PHYLLOTACTICAL.
PROTACTINIUM	• protactinium n. A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal. • PROTACTINIUM n. a radioactive metallic chemical element, a member of the actinide series which occurs as a decay product in uranium ores.
RECONTACTING	• recontacting v. Present participle of recontact. • RECONTACT v. to contact again.
STACTOMETERS	• stactometers n. Plural of stactometer. • STACTOMETER n. a pipette with a hollow bulb in the middle for counting drops, also STAKTOMETER.
STEREOTACTIC	• stereotactic adj. Stereotaxic. • STEREOTACTIC adj. involving or used in a surgical technique for directing the tip of a delicate instrument or beam of radiation using coordinates provided by medical imaging, also STEREOTACTICAL.
SYNDIOTACTIC	• syndiotactic adj. (Chemistry, of a polymer) Having substituents arranged in alternating (rather than random) configuration… • SYNDIOTACTIC adj. of a stereospecific polymer, having alternating stereochemical configurations of the groups on successive carbon atoms in the chain.
SYNTACTICIAN	• syntactician n. An expert in syntax.
TACTLESSNESS	• tactlessness n. (Uncountable) The state or quality of being tactless. • tactlessness n. (Countable) The result or product of being tactless. • TACTLESSNESS n. the state of being tactless.
TACTUALITIES	• tactualities n. Plural of tactuality. • TACTUALITY n. tactual quality.
THERMOTACTIC	• thermotactic adj. Relating to thermotaxis. • THERMOTACTIC adj. of or showing thermotaxis, also THERMOTAXIC.
THIGMOTACTIC	• thigmotactic adj. Relating to thigmotaxis. • THIGMOTACTIC adj. showing thigmotaxis.
TROPHOTACTIC	• TROPHOTACTIC adj. relating to trophotaxis, chemotaxis and chemotropism where the stimulating substance is food.

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: 81 words
Scrabble in French: 25 words
Scrabble in Spanish: 14 words
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 15 words

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