A subscriber line is a term used to describe the telephone line used for residential or business subscribers. However, there are several synonyms for this phrase depending on its context. For example, it can be referred to as a telephone line, landline, or home phone line when it's owned and used by an individual in their residence. On the other hand, when a subscriber line is used in a business setting, it can be called a dedicated line, business line, or office line. Additionally, it might be known as a POTS (Plain Old Telephone Service) line or analog line, which are now phasing out as the world moves towards digital communication. Regardless of the term, subscriber lines are still essential components of modern communication systems.