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err im just guessing... brain power? physicic? weirdo? intelligence? intellect?
Mental alertness!!!!!!!!!!!!
One double-letter word for 'closing' is 'shutting'.
Any fifteen (15) letter word, for example: the word, senti/mental/ize/d, the initial word is mental.
This is likely the English word "imbecile" (an insult related to mental ability).
Skill
There is no double letter word with the letter x
You can spell the letter 'w' as a word like this: 'double-u', or 'double-you'.
Psychotic
Ability is a 7 letter word.
beekeeper
Successfully is a 12 letter word with three set of double letters. Stubbornness is another 12 letter word.