Write the difference between osmosis and …

Osmosis:A process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

Osmotic Pressure:The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution.

Osmosis is a phenomenon where in there happens to be  a movement of solvent particles ( ie. molecules  / ion )  from a solution  of lower concentration  to that of higher concentration when the two are separated from each other by a semipermeable membrane.

while , 

Osmotic pressure  is the pressure built up between the two solution undergoing osmosis . It is  caused due to a difference of vapour pressures  between  both the solutions.