Is there a difference? if so please expain :)
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Yes and No - how's that for an answer? A dehydration synthesis comes about whenever you link two molecules together by "eliminating" water between the two. It gives a product that is a molecule almost the same as the sum of the two starting materials. In a polymerization (most common being polycondensation to make polyester), you need two molecules that have di-functionality so that each condensation doubles (essentially) the molar mass of the starting material. The biggest difference is that the polymerization goes on to make molecules that have a molar mass much greater than the starting materials.