The word for someone who likes to mind or interfere in other people's business is "nosy" or "busybody." A "nosy" person is someone who is overly curious about the personal affairs of others and tends to pry into matters that do not concern them. A "busybody" is a term used to describe someone who meddles in the affairs of others, often with an intrusive or officious manner. Both words have a negative connotation, implying that the person is intruding into the privacy of others without invitation or proper reason.