Re: Negative Kewwords
Yes, you need to add all synonyms to your negative keyword lists. While broad match is a match type option for negative keywords is does not work the same way as a targeted regular broad match keywords - close variants,synonyms etc...are not automatically blocked and need to be specified in negative keyword lists.
I'm a big fan of shared negative lists - I always have one master list that contains negatives that will NEVER be a fit for the account/client and work in more specifics at the campaign/ad group level (if I'm using embedded negatives for instance). I also like to start out any negative strategy with a list of single term "seed" negatives that will block chunks of unwanted traffic - this saves me from having to add too many variations.
Here's a decent explanation as well - from: https://support.google.com/adwords/answer/2453972
Your ads still might show on searches and pages that contain variations of the terms that you select as negative keywords. Your ads might still show on searches that contain only one of your negative keyword terms if your keyword terms are more than one word. Let's say you add the negative keyword "wine bottle." Your ad might still show for searches and pages that contain "stemless wine glasses," "red wine," or "glass bottle." However, your ad wouldn't show for searches on "red wine bottle" or "wine bottle opener."
Just my couple cents.
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