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.
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'.
This is likely the English word "imbecile" (an insult related to mental ability).
Skill
Psychotic
The double consonant word that begins with the letter x is "excess."
Ability is a 7 letter word.
beekeeper