solutions; water
Generally, solvents.
suspensions
its an insoluble substance
solvent
A solute is something that dissolves into a solvent. The solvent is the substance present in the greatest amount (there is always more of it) and the solute is always present in a smaller amount. Together they form a solution.
"insoluble"
It is called a solvent, the substance being dissolved is a solute.
It should be, a compact bouyant substance.
insoluble immiscible (more appropriate for 2 liquids that do not mix)
A liquid that dissolves substances is called a solvent. Solvents can dissolve solids, liquids, or gases, and they are commonly used in various chemical processes. Water is often referred to as the "universal solvent" because it can dissolve a wide range of substances.
A substance that conducts electricity is a conductor. There is no special name for one that is solid; if you need to specify that it is solid, just call it a "solid conductor".
A substance that flows is called "liquid".