A Jacket is not a coat;Mexican food: Taco (no indication that it has to be plural). The common definition of "orate" is to speak or to speak pompously, not declaim.
"Jackets" is just a clue, not a perfect synonym. It's the highest guessed answer at 93%, along with tacos. And how do you propose using just the letters T A C and O to solve the 'necktie' and 'kind of guard' clues? All the answers in that column need to include the letter S, which is also why tacos must be plural...
I liked the quiz, but I could use a bit more time. Would you consider changing "Math point" to "Number system"? For me, math point sounds geometric (like vertex).