Solvent: This is the substance in which another substance (the solute) is dissolved. It's like the forest through which you're hiking.
Solute: This is the substance that gets dissolved in another substance. It's like your backpack - it goes wherever you go, but it becomes part of your overall experience.
Supersaturated Solution: This is when more solute has been dissolved in a solution than would normally be possible under stable conditions. It's like overpacking for your hike - sure, you might be able to carry everything for awhile, but eventually something's going to have to give!