There are several synonyms for the term "companion system." One alternative term is "companion robot," which refers to a robotic device designed to act as a companion to humans. Another option is "assisted living device," which refers to a wide range of technologies that help senior citizens and people with disabilities to live independently. "Personal caregiver" is another possible synonym, which refers to a human caregiver who provides companionship and assistance to individuals who require extra support. Lastly, "smart home technology" can also be used as a synonym, as these systems commonly include features that promote companionship and safety for residents.