1) When writing out the title to this article I noticed that "Thingy" is some how a word, and "Checky" is not.
B) When you are typing, that's a good time to notice that words are misspelled. AutoCAD has been providing this feedback for a while in the form of a red squiggly line under misspelled words.
Right click in the text editor and select "Editor Settings" to put a check mark by "Check Spelling". Or turn it off and be the free spirit you deserve to be.