दिए गए शब्दों के समूह के स्थान पर आने वाले सही शब्द का चयन करें। 'वह जो पत्थर को आकार देता है' (मूर्तिकार)

Choose the most suitable 'one word' for the given expression: 'A person who does not believe in the existence of God or gods'

Which one-word term is used to describe an animal or person that prefers to live, move, or associate in groups rather than in isolation, exhibiting a natural inclination for companionship?