Difference between 顾客, 客, 客户 and 客人

Question

As in the title what is the difference in word usage/meaning between the following fours words:

1. 客
2. 顾客
3. 客户
4. 客人

?

Answer 1

客, guest, visitor. For a shop, it is customer.

顧客, customer. (顧, look back -> visit and revisit.)

客户, customer account, a customer with account. (户, the front door -> household -> account). Some ignore the concept of account.

客人, 人客. guest / visitor (of human).

Answer 2

顾客 and 客户 are customer(commercial ). 客人 means guest. 客 always means being guest/objective,which is contrast to the owner/subjective.

Answer 3

1. 客 is short for 客人 mostly, sometimes short for customer.
2. 客人: guest, visitor
3. 顾客: customer
4. 客户: client