PieOPah, I just find learning a "new language" fun. Based on your initial post, I was prepared to say you should just use Word's US dictionary but as the thread progressed I realized that wasn't what you wanted.
Before Mobileread BLOG, I was only aware of a few differences in spelling and grammar, namely color - colour. I have enjoyed reading posts by several of our UK members and seeing the differences. My grandfather was a British citizen who emigrated to the US so I have picked up some things that way. I've picked up many more from Harry & others here. I like to try to understand the "how's" of language evolution but first I need to learn the "what's".
Definitely didn't mean to upset (flame) you.
(BTW that's a new term for me. Thanks.)