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There are 4 nine-letter words beginning with TAUTO

TAUTOLOGYtautology n. (Uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition.
tautology n. (Countable) An expression that features tautology.
tautology n. (Countable, logic, propositional logic) A statement that is true for all truth values of its propositional variables.
TAUTOMERStautomers n. Plural of tautomer.
TAUTOMER n. a type of chemical compound.
TAUTONYMStautonyms n. Plural of tautonym.
TAUTONYM n. a taxonomic name in which the specific name repeats the generic.
TAUTONYMYtautonymy n. The use of a binomial name consisting of the same word twice, such as Bison bison.
TAUTONYMY n. the practice of using a specific name the same as the generic name.

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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