a person who is addicted to something harmful

person who has compulsion toward

a person who gets help or advice from any professional person

customer

a person who buys things (regularly) from a shop etc

buyer of goods, services

a person who is very interested in something

ardent supporter; fan

a person with a strong interest (in sports, games etc)

person active in interest

supporter; admirer

person who believes or has great interest

a person staying at or paying a visit to another's house or being entertained at a meal

person accommodated, given hospitality

a person who visits

person temporarily in a foreign location