According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 10 words with the pattern -T--K-R. That is, seven letter words with 2nd letter T and 5th letter K and 7th letter R. In alphabetical order, they are:
stacker
stalker
starker
sticker
stinker
stocker
stonker
stooker
striker
stroker