The phrase "people's synonym" refers to a word or expression that can be used in place of "people" and has a similar meaning.
For instance, "persons" could be considered a synonym for "people". Both words refer to human beings in general. Another possible synonym is "individuals", which emphasizes the separateness and uniqueness of each person within a group.
"Folks" is a more informal synonym for "people". It gives a sense of warmth and familiarity. "Citizens" is also a synonym, but it has a more specific meaning related to those who belong to a particular country or community and have certain rights and responsibilities.
In different contexts, different synonyms for "people" might be more appropriate. For example, in a scientific or technical context, "persons" or "individuals" might be preferred. In a more casual conversation, "folks" might be used. And in a political or legal context, "citizens" could be the most fitting synonym.