mixture: a combination of two or more pure substance
there are two type of mixtures
homogeneous & heterogeneous
homogeneous: a solid, liquid or gaseous mixture that has the same proportions of its components throughout a given sample
heterogeneous: made of different substances that remain physically seperate
A suspension is a heterogeneous mixture in which solute-like particles settle out of a solvent-like phase some time after their introduction. We apply the word 'suspension' when particles are big enough to eventually settle. If the particles are too small to ever settle, they are said to form a colloid.
colloid: a homogeneous, noncrystalline substance consisting of large molecules or ultra microscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.