What 8-letter word has the letters KST in the middle, in the beginning, and at the end?

Problem

What 8-letter word has the letters KST in the middle, in the
beginning, and at the end?

Can you supply an 8 letter word that has the letters "KST" (in that
specific order) in the middle, in the beginning, and at the end.
Funny thing though, there is only one K, one S, and one T in the word.

-- Doug McKean <doug_mckean@paragon-networks.com>