Here's the most common use of those words you cite above that I have observed:
Socialist : ‘ A Democrat ’
Communist: ‘ A Democrat that says that Obama is too conservative or is a conservative ’
RINO :’ A Republican we strongly disagree with or don't like ’
Unconstitutional :’ A law we don't like ’
Illegal :’A poor Mexican or from similar country in America that is here illegally or was born here to a mother that is here illegally’
There is a strong correlation.
Another very abused word on FR is “populist” (thanks to Limbaugh).