They started as same word, but their meanings have drifted apart over time.
'Poets laureate'? 'Court-martials'? The curious history of postpositive adjectives in English.
There, there. We'll sort it out.
A definitive answer.
Why don't they call it the Merriam-Webster comma?
And how did it get that name?
Many of today's grammar rules can be traced to the opinions of one 18th century writer.
