There are numerous synonyms for the phrase "brain works" that can accurately describe the process of the brain's functioning. One such synonym is "neurological activity." This term refers to the electrical and chemical processes that occur in the brain during thought, memory, and learning. Additionally, "cognitive functioning" is a phrase that describes how well the brain is working in terms of perception, attention, and reasoning skills. "Mental acuity" is another synonym that refers to the brain's ability to process information quickly and accurately. Lastly, "brain activity" is a broad phrase that encompasses all of the complex processes that occur within the brain.