Qesue, if I am right with the theme there are two or three possible answers. As I said, I live this every day!
One starts with a specific 5 letter word (in fact there may even be 2 five letter possibilities) but there is also a more general 6 letter word. Which have you gone for? Is there a clue in the grid as to the actual answer required?
Tomsdad - the 10 words you need to find all have one similar meaning. I was thrown at first until I checked all the definitions. Of the additional letters it is split into three words with lengths of 10, 7 then 5.