bed
Successfully is a 12 letter word with three set of double letters. Stubbornness is another 12 letter word.
zoo
Three possibilities are same, pair or twin.
bookkeeper, bookkeeping
Double OR if you're talking about twin brothers = jumeaux, or twin sisters = jumelles
One seven letter word, One two letter word and a five letter word, One three letter word and a four letter word, One three letter word and two two letter words, Two three letter words, Three two letter words, A two letter word and a four letter word, A six letter word, A two letter word and a three letter word, A five letter word, Two two letter words, A four letter word, A three letter word, or A two letter word.
twin, copy, mate
One double-letter word for 'closing' is 'shutting'.
I've is a three letter word. I'll is another three letter word.
None in the English language.
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'.