COME IN (1), COME OVER (2)

come in = enter a room or building

examples:

• Come in and close the door.
• Don't just stand there! Come in and sit down.
• She knocked on the door and waited. A voice was heard: "Come in, please. The door is open."
• He came into my room when I was away and found my diary. 
• I will tell him to call you as soon as he comes in.
• The rain is coming in through the balcony door. 

come over = visit
examples:

• Come over tonight and have dinner with us.
• Come over to my office tomorrow and we 'll talk about it.
• Come over and see us next time you 're in town. 
• Why don' t you come over to my place after work?
• My grandson comes over to see me from time to time.
• Kate and Alan are coming over for the weekend.