When it comes to writing or speaking, it is crucial to have a variety of words to describe an important part of something. Instead of repeatedly using "important part," you can use synonyms to add variety to your language. Some synonyms that can be used instead of "important part" include crucial element, integral component, significant aspect, essential feature, pivotal factor, vital segment, key component, critical ingredient, indispensable portion, and fundamental aspect. Utilizing synonyms can help in creating more engaging and impactful communication, as well as enhancing the overall quality of your writing or speaking.