As far as not understanding the word "yellow", here's an example for ya...
Up until about a hundred years ago, the Japanese made pretty much no distinction between blue & green. Of course, you have the word "midori", but it was used mostly to describe nature. Even today, ask any Japanese what colors are used in traffic signals, and they'll tell you, "Aka, kiiro, ao"..."red, yellow, blue".
Perfectly understandable to me, then again, could just be because I've lived here too damn long



