Rebuild an RPM

Hi SuSE folk, I know this has benn discussed at least a hundred times, but: I downloaded an msfonts-1.2.1-1.src.rpm file. I did a --rebuild I ended up with a noarch.rpm. ????? Reallynot even sure what a noarch.rpm is. I think it is just an rpm without a spec or source file. Now, there was an msfonts.spec file there which I also downloaded but didn't pay much attention to. Can someone tell me what I have done wrong? Bob S.