You asked for it...8-letter words aardvark, aardwolf, aasvogel, abacuses, abalones, abampere, abandons, abapical, abasedly, abashing, abatable, abatises, abattoir, abbacies, abbatial, abbesses,...
If you want a better answer, then you should tell people WHICH LETTER IT IS -.- So since you didn't tell me what letter was in it, i have no idea what the answer is =P edit: the 8 letter word is...
Eighteen brighten grounded
I think it is sextets which are groups of six. XO, Smartiiz. sextest
There is no 8-letter form using the letters SHTRANNACXKN.The longest common English words are anthrax and ransack.