Well, if gelatin is a little plate of translucent wobbly tasteless food, then that’s it. I’m not entirely uptodate on what these things technically are…
As for lemonade, well, I always wondered where all those little kids in movies carbonized their homegrown lemonade 
If I remember from my Brit friends correctly, at least on the other side of that drink the term used for our “lemonade” is “lemon squash,” but I think with rather less sugar. Same on your side of the other drink?
Oh, and as is noted in another thread, our “jelly” is a subset of jam. I think our Department of Agriculture has regulations on this - “jam” has fruit pulp in it, whereas “jelly” is made from clarified juice. Neither involves gelatin.