You are asking us to construct a seven letter word, using twelve letters. This does not seem to be mathematically possible.
There is one seven letter word from the letters 'TWSOUIT'. When unscrambled the letters spell the word outwits.
suites-that;s odd, six letter word, 7 letters tissue (or even tissues with the 7 letters)
snowday
mailbox
There is no seven-letter word in the English language using those letters.
There are no 7-letter words with those letters, there are a few 6-letter words though:grieveregivereviewviewerweever
The word bronchi can be spelled with these 7 letters.
There is no 7-letter word available with those letters, the longest words are these 6-letter words:garveygreaveraggeeregavereggae
The letters spell ravened. It is a 7 letter word.
There is one seven letter word from the letters 'TWSOUIT'. When unscrambled the letters spell the word outwits.
suites-that;s odd, six letter word, 7 letters tissue (or even tissues with the 7 letters)
There are three 7-letter words possible:roosterrooterstoreros
uplinks
"HISTORY:
There is no 7-letter word using these letters, but there are these two 6-letter words:adroitdiatom
snowday
sultana