I don't have enough rep to directly suggest a synonym, but I have just observed (via a question that was closely related to one I asked a while back) that there are separate jello (9 questions) and gelatin (48 questions) tags, with no overlap. I believe that Jell-O is just a brand name for gelatin products, so is there any reason why it should not be a synonym of gelatin?
1 Answer
Agreed, I can't think of any occasion where "gelatin" won't cover "jello".
Synonym created.