Summary vs Synopsis - Reviews

So this may be the silliest thread you've ever seen, I would accept that. But someone, help me out here.

I can't seem to nail down the difference between a summary and a synopsis. Google had only gotten me so far, and each website seems to have a different opinion on how to write each.
I ask because I'm going to begin querying soon, and I don't want to send an editor who asked for a synopsis a summary instead.
Main problem for me- which one is the back of a book blurb and which one do you outline the major events of the book, including the ending??

You'd think this was a simple thing...

Anyway, sorry if I started a new thread that already exists somewhere else. I couldn't find anything when I looked in the forum.
 
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