If you flag it, they will add it. It gets better as people add things in the flag section. Different parts of the U.S. use different word choices. We all have all different kinds of accents, idioms, and colloquialisms. Sometimes we even struggle to understand each other, so I can understand your frustration. That's how I learned to flag it because I would use a word that I knew, but it wasn't necessarily the American word they had listed.
Give it a try and see what you think. Hope this helps.