Hi Kalyan,
These are the difference and meaning of these words.
Synchronize requests that a node synchronization operation be performed using the normal synchronization optimization algorithm. This operation is fast, but might not fix problems from manual file edits that occur on the node. It is still possible for the node and cell configuration to be out of synchronization after this operation is performed.
Full Resynchronize clears all synchronization optimization settings and performs configuration synchronization anew, so there is no mismatch between node and cell configuration after this operation is performed. This operation can take longer than theSynchronize operation.
Hope it is helpful, revert for any other query.