There are several synonyms for the phrase "are in favor of." Some common ones include "support," "endorse," "approve," "back," "champion," and "advocate." Each of these words conveys a sense of agreement and approval towards a particular idea or action. Using these synonyms can help to add variety and nuance to your language, particularly when writing or speaking about complex or controversial topics. Whether you're working on a project for school or delivering a speech to a large audience, utilizing synonyms for "are in favor of" can help to enhance your message and underscore the importance of your argument.