The phrase "the brains" typically refers to the smartest or most intelligent person in a group or organization. Some synonyms that capture a similar meaning include "the genius," "the mastermind," "the intellectual," "the brainiac," and "the prodigy." These words all suggest a high level of intelligence, knowledge, and creativity. Other related terms include "the thinker," "the analyst," "the strategist," and "the innovator." Overall, these synonyms emphasize the importance of smart and strategic thinking in achieving success in various areas of life, including business, education, and creative pursuits.