Synonyms for "citizen"

General Synonyms:

• Resident
• Inhabitant
• Native
• Subject (though this term can have more negative connotations)
• National

More Specific Synonyms:

• Burgher: (A citizen of a town or city)
• Denizen: (An inhabitant of a particular place)
• Subject (Specifically referring to someone under the rule of a sovereign)

The best synonym will depend on the specific context and the nuance you wish to convey.

For example:

• "Citizen of the United States" could also be expressed as "National of the United States" or "Resident of the United States."
• "Citizen of the world" might imply a broader sense of global citizenship and could be expressed as "Inhabitant of the world" or someone who feels a connection to the entire planet.

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