When it comes to the word "invest", there are several synonyms that can be used to convey similar meanings. One such synonym is "finance", which refers to the act of providing funds or financial backing to a venture or project. Another synonym for "invest" is "back", which focuses on supporting and endorsing a particular initiative or idea. "Fund" is another possible synonym, as it highlights the provision of financial resources for a certain purpose. Alternatively, "stake" can also be used to refer to the act of investing, often indicating an ownership or personal interest in a project or venture. These synonyms offer alternative ways to express the act of investing and provide variations in tone and emphasis.