Bad Non-Curse words....

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What are some "non-curse words" you don't allow your children too say? My neighbor mentioned I'm over bearing because I don't allow my 9yr old too say words like; Stupid,Hate or Liar. Growing up my parents were very strict with these words as well(for legit reasons) and even though I'm 32 I still can't say these words in front of my parents without them flicking my forehead. I can curse up a storm in front of my parents without them batting an eye,but these words,forget it!So,what are some words you don't allow your children too say that aren't curse words?