What words refer to going to someone's place to see them?

visit, pay a visit, call, call on, drop by, drop in on, go round, make the rounds, look in on, see, spend time with, stop by,

What words refer to agreeing to visit?

make an appointment, arrange a visit

What words refer to a visitor?

visitor, guest, houseguest, overnight visitor, caller,

What words refer to a visitor who stays for a long time but doesn't pay or help with the work?

freeload, freeloader, sponge, sponger,