How to find out if a word is native Japanese or Sino-Japanese (for keigo)

I'm learning keigo and in order to fogure out whether a word needs an initial ご or お added, I need a way to easily look up whether a word is native japanese or sino-japanese. Are there any online dictionaries that list this info? It's so hard to find on google just by looking up the word. And jisho doesnt list the word origin. Please help!!