What do you call a person who lives a solitary life?

A person who lives a solitary life is referred to as a recluse. This term specifically describes someone who tends to avoid social situations and prefers to spend their time alone, often leading a lifestyle that is isolated from others. The concept of reclusiveness is tied to a preference for solitude, where the individual may find comfort and peace in being by themselves rather than seeking out the company of others. This characteristic is the primary focus of the word "recluse."

The other options represent groups or lifestyles that involve social interactions or community. For instance, a companion generally implies someone who is with others and offers companionship, while a socialite is actively engaged in social activities and gatherings. A nomad, on the other hand, refers to a person who moves from place to place, usually in search of resources or better living conditions, which does not inherently suggest solitude. Hence, the term "recluse" is the most accurate descriptor for a person who lives a solitary life.