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ALLOYS - a metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion.
COLLOIDS -a homogeneous non-crystalline substance consisting of large molecules or ultramicroscopic 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
a suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. Usually they must be larger than one micrometer.
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Colloids: A homogeneous-looking heterogeneous mixture in which particles having size between 1 and 1000 nm (nm is the symbol for nanometre: 1 nm = 10 to the power -9 m ) are dispersed in a continuous medium is called a colloid.In colloids, particles of the dispersed phase may be 10 to 1000 times the size of a small molecule.Colloids are commonly called sols. The constituents of a colloid cannot be separated by filtration.

.Suspentions: A suspention is a heterogenous mixture in which very fine particles (about 10 to the power -7 m) of a solid remain suspended in the medium. The particles in a suspention can be seen with naked eyes or under a simple microscope. They have a tendency to settle down. 
The constituests of a suspention can be separated by ordinary filtration.

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