ODONYM AND OTHER WORDS Spell Check DOESN'T RECOGNIZE

In my blog article DOWN THE PIKE, I quoted my brother using the word "odonym". Spell check does not recognize the word. I was certain of the spelling, but I still diligently checked my OED just to make sure!

This happens to me frequently! This week, while writing my blog, I have been "SPELL CHECKED" several times. I can understand Spell check not recognizing foreign words such as borlotti, or unusual words like polysemic, asudden, rupestrian, and oscitancy, BUT pepperoncini and Facebook?

Also curious: it does NOT recognize "Barack" but it DOES recognize "Obama"!