Both compounds and mixtures can be said to be composed of more than one substance. But compounds are one substance composed of two or more elements. Mixtures can be separated into their components by less dramatic means.
True solutions are transparent, suspensions are cloudy.
Let students look at sample of salt, sugar, and salt and sugar mixed. Dissolve salt or sugar in water. Add a drop of food coloring. Mix cornstarch in water. It doesn't dissolve, but doesn't settle out either.