one object has greater density than another when it has
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If an object placed in water sinks - then it has a density greater than water.
A density greater than that of water (which varies with temperature).
The density of an object is its mass divided by its volume. If that is less than the density of water, it will float; if greater it will sink
If inserted into the water as a solid "blob" then it will sink - unless it dissolves first. But, if because of the shape, the mass of water displaced by whole object is greater than the mass of the object, it will float - just as ships made of metal do.
[object Object]