Formal:
* Persons: This is a direct synonym for individuals.
* People: This is a more general term, referring to humans collectively.
* Subjects: This word implies a group being studied or observed.
* Entities: This is a broad term that can refer to individuals or organizations.
* Actors: This word implies individuals who are active participants in a situation.
Informal:
* Folks: This is a casual way to refer to people.
* Guys: While technically referring to men, it's often used colloquially to address a mixed group.
* Humans: This emphasizes the species.
* Persons of interest: This is used in a legal or investigative context.
* The masses: This implies a large group of people.
Other options:
* Members: This refers to people who belong to a group.
* Citizens: This refers to people who are residents of a particular country.
* Residents: This refers to people who live in a particular place.
* Fellows: This is a more formal way to refer to people who share a common interest or purpose.
The best word to use depends on the specific context and the tone you want to convey.