Shinigami is the Japanese gods of death. Examples are: Ryuk and Rem from Death NoteMeroko and Takuto from Full MoonRukia and Renji from BleachBotan from Yu Yu Hakasho~ Yukishinigami are people that...
A lot of kanji overlap, either on meanings or pronunciation. A good site will show you the word, and then a rough English equivalent. If it doesn't, the best thing to do is use one that goes both...