The verb "know" is a common term used to express comprehending or understanding something. However, there are plenty of alternative words you can use to better describe your level of understanding. Some synonyms for "know" include comprehend, grasp, understand, perceive, recognize, discern, conceive, realize, and fathom. Each of these words has its distinct meaning and connotation, so it is essential to choose the appropriate word for your context. For instance, if you want to describe an individual's deep understanding of a subject, then you might use the word "fathom" rather than merely stating that they "know" it. Varying your vocabulary choices helps to keep your writing lively and engaging.