This paper examined how proper nouns are converted to a common entity noun in a more comprehensive universe of discourse and a common entity noun to a proper noun in a more restricted universe of discourse. A proper noun, which was named in a more restricted universe of discourse, is converted to a common entity noun in a more comprehensive universe of discourse. Family names like Smith are frequently converted to a common entity noun when uttered in a larger community as in The Smith I mean is a Scottish economist. A common entity noun, which was named in a more comprehensive universe of discourse, is converted to a proper noun in a more restricted universe of discourse. President is converted to a common entity noun when uttered among people of a nation as in President made an address on TV.