I actually looked up this same answer, but it was because I forgot how to get to edge's rainbow and kept schlepping up Mt. Gelato the old fashioned way. You need to go to Brownie Ranch and take Alan's rainbow to get to Edge's rainbow to meet all the sprites. Hope that helps!
Rainbow Racers Rainbow Racers Rainbow Racers Rainbow Racers Rainbow Racers Rainbow Racers
The letter W because Rainbow ends with a
harvest
Rainbow
Reap
In alphabetical order, "rain" comes before "rainbow." This is because the letter "i" in "rain" appears before the letter "b" in "rainbow." Therefore, rain is listed first.
rainbow
fogbow, sunbow
Reap.
harvest
There are seven colors in the rainbow, and "seven" has five letters. ROY G BIV is the traditional mnemonic for the colors of the rainbow.
Over the rainbow