Perhaps you can be more specific. Each is in the dictionary, my dictionary anyway Webster's Seventh New Collegiate, 1971. I do not mean any of the terms in my statement 'colloquially'.
they're in the dictionary, sure, but not with the meaning that FReepers often attribute to them. At least not in any dictionary thet I've seen. What definitions does your Websters give?
http://dictionary.reference.com/search?q=subject shows subject to be
"One who is under the rule of another or others, especially one who owes allegiance to a government or ruler. "
and citizen to be
"A person owing loyalty to and entitled by birth or naturalization to the protection of a state or nation. "
whereas Freepers usually base their definitions around whether or not a person can own a gun for self defence or not. Before WWI Britons had liberal gun laws but definitely were subjects. These days we have harsh gun laws but are citizens. The 2 just aren't related, unless you wish to redefine the words, which is what has happened on FR. nothing wrong with it of course, but is still a slang meaning.