Suspension: This is a type of heterogeneous mixture where solid particles are dispersed in a liquid or gas but over time may settle at the bottom of the container.
Colloid: This is another type of heterogeneous mixture. However, unlike suspensions, the particles in colloids do not settle out over time and cannot be separated by simple filtration.
Phase: In context to mixtures, phase refers to any part of a system that has uniform composition and properties. In a heterogeneous mixture, there are multiple phases present.