how are colloids and suspensions solutions?
The definition of solution is a little bit cloudy. IUPAC define a solution in this way:


  A liquid or solid phase containing more than one substance, when for
  convenience one (or more) substance, which is called the solvent, is
  treated differently from the other substances, which are called
  solutes.


And indeed this is a quite general approch that takes in account that we usaually call solutions systems (such as metallic solution) that are not compose of single molecules or ions dissolved in a solvent. Besides this approch chemists generally call solution a system with the folowing charachteristics:


It is stable.
It has only one phase.
It has to be an homogeneous mixture of two or more substances.
The solute can't be distinguished from the solvent (no scattering, can't be filtered)


And so I would not define colloids and suspension solution because they have a dispersed phase and often they are not stable.