According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 6 words with the pattern -E-T-TT-.
That is, eight letter words with 2nd letter E and 4th letter T and
6th letter T and 7th letter T. In alphabetical order, they are:
septette
sestette
sestetto
sestetts
sextette
sextetts