There are many synonyms for the word "intellectualities" that can be used in writing or conversation to convey similar meanings. Some of these synonyms may include concepts like intellect, mental acuity, cognitive ability, scholarly pursuits, academic interests, or even simply education. Depending on the context and intended usage of the word, one may opt for different synonyms to highlight different aspects or connotations related to intellectual activities. Ultimately, synonyms can provide a way to expand one's vocabulary, add nuance to one's writing, and capture precisely the tone or meaning desired.