The word "philosopheme" refers to a fundamental idea or concept in philosophy. However, there are a few other ways to express this same meaning. One way is to use the word "philosophical concept." This phrase is straightforward and easy to understand. Another option is to use the term "philosophical notion," which has a slight variation in meaning, suggesting an idea that is still in development. "Philosophical principle" is another phrase that can be used to describe a fundamental idea in philosophy. Lastly, the term "philosophical theorem" is a synonym for philosopheme that suggests a logical statement that can be proven or disproven.