Ocean water can be a solution as well as a suspension.
What is a solution ?
A solution is a homogenous mixture of two or more components.
A suspension is a heterogenous mixture in which the solid particles do not dissolve in the solvent.
Since sea water contains completely dissolved salts it acts as a solution. On the other hand, it also consists of sediments like sand, pebbles, etc. therefore it acts as a suspension as well.
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