Refer to the following screenshots to accomplish comparison and synchronization the synonyms of two databases.
Step 1: Open SQL Server Comparison Expert, click "Connection" button, then the connection dialog pops up.
Step 2: Click "Option" to open the Project Option, you can select the Object Types (Synonyms) to compare. Click "OK" to continue.
Step 3: Click "OK" in the connection dialog, select the "Compare" button to compare the differences between the two database synonyms.
Step 4: Click "Synchronize", you can find the differences of synonyms shown on the script.
Step 5: Click "
Sync" to synchronize the synonyms. Then you will find the "
Action" status changed from "

" to "

".
Step 6: Click "Compare" button to check the result after synchronization. If you couldn't find differences, thus, the synchronization is completed successfully.